That is not the case. No matter where you install them, its sandboxed. See here: https://grapheneos.org/usage#sandboxed-google-play
Basically it’s Google Play Services but without any special access or privileges like it normally gets.
Discussion
Interesting. Every video I watch I swear they recommend to install in a seperate user profile.
Never watched any vids on it myself, just going off of the documentation.
When I used Calyx I would do that because microG is not as sandboxed or hardened as sandboxed GPS on Graphene. So I’d set up all my apps that needed it in the work profile.