Not only that, but typically also their device ID features. So, for example, your banking app won't work on LineageOS with some free re-implementations of GApps.
"Open" GApps for custom Android builds are not open re-implementation. It was a middle ground between ROM communities and Google reached some decade ago, to disallow inclusion in the ROM and limit redistribution to forms and channels agreed upon.
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Not only that, but typically also their device ID features. So, for example, your banking app won't work on LineageOS with some free re-implementations of GApps.
https://wiki.lineageos.org/gapps
https://www.reddit.com/r/degoogle/comments/h06x5i/bank_app_w...
For me, mandating a mobile app is a deal breaker.
"Open" GApps for custom Android builds are not open re-implementation. It was a middle ground between ROM communities and Google reached some decade ago, to disallow inclusion in the ROM and limit redistribution to forms and channels agreed upon.
However, there is a free reimplementation of GApps, namely microG. Not what OP linked to, but it does exist.