As an anecdotal example, Uber Eats/Grubhub/Seamless fees are a material portion of total ticket price in DC (which seems to be different in other cities). They are also rarely subsidized for customers here. I am still eating at the same restaurants and probably get take-out just as much as a New Yorker where delivery is way more common - but I just walk over to pick it up.
Similarly, when Uber is surging, I take the bus or the metro.
Part of what makes cities so appealing is the diversity of options. If consumer-tech-based apps get more expensive, there are actually alternatives to literally all of them. I don't need a Peloton - I can just get a gym membership somewhere. Or buy a bike.
100% agree that Millennials are likely about to change their lifestyle options. But not certain that "change" directly equates to "accept higher prices."