I got kinda burned when I tried to order direct from a restaurant. The last time we ate there they included a little "order online" card with a link to their website. So the next time, in the spirit of supporting businesses directly, I went to their site and ordered. They did use a third-party handler (ChowNow I think?), but I figured it was a kind of order management third-party. In fact, after placing the order, I got an additional email from that third-party handler congratulating me on ordering directly from restaurants, and that they explicitly don't charge restaurants a fee. Neat, right? Well, Lo and behold, behind the scenes they just used DoorDash to handle delivery...
That sucked because A) it was more hassle for me to sign up for Yet Another Account, and B) I have DashPass (free delivery and discounted service charge) but didn't get to use it, so it ended up costing me more even with the coupon the restaurant threw in.
Hell, there are even pizza places around me that use DoorDash for delivery. Pizza places, for goodness sake!
It's a weird world I suppose.