I’m sure you’ll agree that’s quite the statement from Motley Fool Co-Founder Tom Gardner.But since our US analyst team first recommended shares in this unique tech stock back in 2016, the value has soared.What’s more, we firmly believe there’s still plenty of upside in its future. In fact, even throughout the current coronavirus crisis, its performance has been beating Wall St expectations.And right now, we’re giving you a chance to discover exactly what has got our analysts all fired up about this niche industry phenomenon, in our FREE special report, A Top US Share From The Motley Fool. Roland Head | Sunday, 6th December, 2020 | More on: JET Click here to claim your copy now — and we’ll tell you the name of this Top US Share… free of charge! Enter Your Email Address Lockdown living has meant that it’s been a brilliant year for food delivery services. One of the biggest players in this market is FTSE 100 share Just Eat Takeaway.com (LSE: JET).Just Eat Takeaway’s revenue rose by 44% to €1bn during the first half of the year. Restaurant numbers rose by 32% and the value of food ordered on the platform climbed 42% to €5.7bn.5G is here – and shares of this ‘sleeping giant’ could be a great way for you to potentially profit!According to one leading industry firm, the 5G boom could create a global industry worth US$12.3 TRILLION out of thin air…And if you click here we’ll show you something that could be key to unlocking 5G’s full potential…The shares performed well too. At least they did until the start of November. Since good news on vaccines caused the stock market to surge higher, JET’s share price has fallen by about 15%. Unfortunately, I think these shares could have further to fall.What I like about JETDespite my concerns, I think there’s a lot to like about Just Eat Takeaway. It’s one of the biggest operators in this sector, with a strong brand and growing economies of scale. Unlike some rival delivery operators, JET is expected to report an after-tax profit for 2020.The company has become a FTSE 100 share by buying up rival operators in its markets, with the aim of becoming the dominant brand. The acquisition of Takeaway.com earlier this year was the biggest deal yet, but JET is also in the process of acquiring US-listed Grubhub. This deal was valued at $7.3bn when it was agreed in June.JET’s management is currently increasing its marketing spend in countries where the firm doesn’t yet have control of the market. One example of this is the UK — rumour has it that rapper Snoop Dogg was paid £5m for the television ad campaign that’s run this autumn. I expect positive results.Why I think this FTSE 100 share will fallI think it’s fair to say that the pandemic has created the most perfect market conditions anyone could imagine for food delivery. In most of JET’s main markets, restaurants and bars were closed for extended periods. At the same time, millions of people were stuck at home, often while still receiving their normal pay.Performance this year reflects this unusual situation. The company has seen order numbers rise by 37% this year, from 298.4m to 408.3m. JET has also continued to expand. In the UK, for example, new partnerships with McDonald’s and Greggs have added a total of 1,100 new restaurants.However, we’ve already seen during the summer how people are quick to return to restaurants and pubs as soon as they reopen. I’m not sure that the impressive growth rate seen this year will be sustained.An expensive takeawayI think this is a good business in a sector that will keep on growing. But Just Eat Takeaway shares already trade on around 100 times 2021 forecast earnings.Even for a small growth stock, that would be a demanding valuation. But smaller companies can generally grow faster. Just Eat Takeaway is already a FTSE 100 share with a £12bn valuation. How much bigger will it get?If the firm’s earnings doubled again from 2021 forecast levels, JET would still trade on 50 times earnings. I think that’s probably where the shares should be today. But for JET’s valuation to fall to that level, its share price would have to fall by more than 40%.In my view, the risks of investing in JET today are greater than the potential rewards. For this reason, I’m not buying the shares. Renowned stock-picker Mark Rogers and his analyst team at The Motley Fool UK have named 6 shares that they believe UK investors should consider buying NOW.So if you’re looking for more stock ideas to try and best position your portfolio today, then it might be a good day for you. Because we’re offering a full 33% off your first year of membership to our flagship share-tipping service, backed by our ‘no quibbles’ 30-day subscription fee refund guarantee. Warning! I think this FTSE 100 share could fall 40% in 2021! Roland Head has no position in any of the shares mentioned. The Motley Fool UK has recommended Just Eat Takeaway.com N.V. Views expressed on the companies mentioned in this article are those of the writer and therefore may differ from the official recommendations we make in our subscription services such as Share Advisor, Hidden Winners and Pro. Here at The Motley Fool we believe that considering a diverse range of insights makes us better investors. Simply click below to discover how you can take advantage of this. Our 6 ‘Best Buys Now’ Shares Image source: Getty Images “This Stock Could Be Like Buying Amazon in 1997” I would like to receive emails from you about product information and offers from The Fool and its business partners. Each of these emails will provide a link to unsubscribe from future emails. More information about how The Fool collects, stores, and handles personal data is available in its Privacy Statement. 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