I first learned about them because I ordered a kebab on Just Eat and my order arrived with a flyer inside saying "please use them next time, they charge us less."
The site is honestly a bit janky and regularly annoys me slightly ... but only slightly, and I'm happy to deal with that to have all the revenue go to a local company and my favourite food places - and the cost is at worst identical to the venture capitalist subsidised companies and sometimes lower.
I have a possibly misplaced hope that they'll survive the collapse of the VC players. I intend to live in hope anyway though because (a) I much prefer my money to stay local (b) they're the easiest way I've found to order from the chinese place with the best prawn toast I've ever had.
If they disappear at some point I'm going to have to go back to phone calls and paying cash on delivery, and while I love the places I order from enough to do that if I have to I'd really rather not.
The cost right now is subsidised by VCs to get everyone to switch.
With the incoming recessions VC will spend less money, especially on a business model which doesn't feel novel anymore.
A centralised "we pick your food for you"? Unlikely