I'm considering doing this with Deliveroo as I live in North Adelaide, and there seem to be about a dozen restaurants on the main strip that use them. Many also use Ubereats. I might try out both. North Adelaide is mostly flat and fairly well off. A couple of my neighbours seem to get ubereats all the time!
I used to cycle a lot, especially commuting, and a few years ago did a cycle tour from Aus to Europe, so the cycling doesnt phase me, and even if it isn't a big earner, good excuse to do more riding and get uberfit again (get it, that's a Dad joke!).
If I don't like it, I'll just stop. Got a job already. This is evening fun, potentially :-)