I don't personally know anyone who uses doordash regularly, but I've seen a handful of commenters on hn complaining about doordash while pretending there's no possible other way to get their food (even after getting possible alternatives). Just wait for doordash to come up in the news again and see if you can't ask someone anonymously about it here :)
I complain about DoorDash but still use it because around me there's no meaningful alternative for delivery. Even pizza places around here have ditched organic delivery service and just use DoorDash.
I don't use DoorDash all the time, I save it for when I've been busy and don't feel like cooking and cleaning. It's usually a replacement for going out to eat.
I can't understand people that use it all the time though. Even the relative convenience comes at a significant cost. A lot of restaurants have higher prices on DoorDash or have required up-sells be added to meals. With the fees you're spending more than you would if you ate the same meal at the restaurant.
I completely understand the occasional delivery where convenience trumps price but constantly paying a 20-50% markup on meals is ludicrous.