I would never install one of these apps (more for security/privacy than information detox) but if Uber can abuse the notification system for advertising then it wouldn't surprise me if these companies would too.

Interesting, because my Uber has notifications disabled but my delivery apps have them on.

When I'm waiting for Uber to arrive I know it will come, because I just ordered it, so I just check my phone.

Maybe I'm lucky with my delivery apps because mine don't send ads.