I also ran into the eBay application being blocked just recently. Other than that I've had no issues, but I imagine this is going to become more and more common as time goes on.

eBay has been enforcing Play Integrity for over a year now. Luckily you don't lose much by using it in a browser.

I also get why they'd be desperate to fight bots. It's a weak excuse for not doing it better, but at least it makes some sense.