And there is still the 14 eyes agreement

It doesn’t interoperate well with FOSS software like K9 and Thunderbird.

Libretube works for me, but not Tubular.

He wants to try before accepting the deal.

I don’t know if there exists such a thing as GrapheneOS account, but it is not required. You can add Google, Facebook or other accounts like with regular Android. I use a self hosted Nextcloud instance to synchronize contacts and calendar with DavX5 app. GrapheneOS has built-in apps. I use most of them. For the app stores I mostly use Fdroid and Aurora store for non open source software. I don’t use Google play store even sandboxed because I don’t accept the terms of use, mostly because they have the right to uninstall apps from your phone without consent or notice.

I think my first donation would be to GrapheneOS.

The argument that Debian doesn’t have the latest packages is only valid for stable repository, right?

Wouldn’t Debian with unstable or testing repo be better than Linux Mint?