Apps have to choose to block using a non-stock OS and only a tiny minority of them do it. GrapheneOS bypasses it for many of them and we intend to get it fully resolved. Regulatory action is in progress for this in Europe already and it will be solved. GrapheneOS users can currently use nearly all Android apps with the exception of a subset of banking/financial apps and a tiny number of other apps. Google trying to crack down further will greatly increase the already incoming consequences in multiple countries for the existing Play Integrity API.