TLDR:

When reCAPTCHA flags what it considers suspicious activity, it abandons the old image puzzles and demands you scan a QR code. That scan requires Play Services running in the background, communicating with Google’s servers. If you’re using GrapheneOS or any other custom ROM that strips out Google’s software, the verification fails.

I think the monopoly is pretty obvious at this point. No company should have this many strings to pull to maintain market share.

There’s no way this is fair competition.