I worked GrubHub back in 2018 when I was between jobs(took some time off to do side projects and did deliveries to make ends meet). These apps play this psychological game on you where you have to accept something like 95% of orders in order to get more quantity and quality(supposedly), so some people are desperate to take all the shitty no-tip orders just so they have a shot at getting better ones.
The funny thing was the lowest acceptance rate I had was 3%, and that's because I hung around a rich area of town and waited for those sweet $20-$50 orders that were only a few miles distance. Always felt like I got the golden ticket. I never got fired for having that low of an acceptance rate.
There were some fellow drivers I talked to on Reddit that got kind of a bad deal. They would drive for GrubHub or DoorDash at a town in Podunk, Nowhere with low demand and would often get sent those kind of orders that were 10+ miles away for $3. If that happens to be the demand, then you're either screwed taking bad orders or you're screwed if you reject too many of them and you get fired.
I think the reason I never got fired is because the LA area, at least while I was doing it, was hot(figuratively) and GrubHub just wanted to fill up the market with as many drivers as possible. In areas where they've fully met the demand, then your arse can be on the line if you reject too many orders.
Overall, it was a fun job to have for a while. But it would suck big-time if I had to actually do it for a living. Thank god I'm good enough at software engineering.
EDIT: Saw lots of hilarious things happen while I was on the job. It's amazing how many women order food while they're taking a bath and then either forget to answer their phone or they come to the door wrapped in towels. WTF! I once delivered a 2 dozen donuts to this one guy at ~10:30pm who was super high accidentally walked into the door before opening it. Also had some sad moments, like those times I delivered to an elder hospice. This one sick old lady wanted to give me a handsome tip, but I didn't want to accept it because I just felt like she deserved that ice cream in her condition and was just happy I brought it to her. But she insisted because she said it might be her last ice cream. :(