You can quibble about a specific food, but I think the general point stands. Habits are powerful and they can change. Every adult in the country (world?) is now forcibly learning how to cook or practicing a few new recipes. It turns out that some of those recipes are delicious, dead simple and once you know how to do it, having someone else do it for you looses it's convenience factor.

For myself:

I love cappuccino and bought several per week from cafes near me. I was missing them, so did a bit of research into home espresso and bought a nespresso and semi-automatic milk frother. My homemade cappuccino is excellent. It takes 2 minutes to make with just about zero cleanup. I have had better cappuccino, but seriously the extra time, money and hassle are no longer worth it for me. I will make it at home. It's also 6x cheaper.

I like to treat myself to steak every now and then, but only ever at a restaurant. I recently bought a package of strip steaks and did some trial and error on a George Foreman grill I found in the back of the cupboard I hadn't used in years. I figured out a process that works with that piece of equipment, and now I can knock out an amazing steak in exactly 4 minutes. It's cooked exactly how I like it. Why bother with the hassle and expense of going out for one? Plus it's 4x cheaper.

I doubt I'll completely stop going out or getting delivery, but if I reduce by 10% and everybody else does too, we're talking a lot of businesses that will close.