Luckily for you this already exists, and it’s effectively SteamOS:

https://bazzite.gg/

You can even put this on a Steam Deck as a drop-in replacement.

They use open source solutions for this, so you can spin up your own version if you want. It’s just Matrix with bridges.

You could use Beeper, which connects with Whatsapp without needing the app installed.

They have nothing to hide but they have IP to protect to stay in business. What a ridiculous thing to say.

The “minimal” part is incorrect; it is a super complicated container. The number of moving parts don’t leave me with any confidence that I could keep it running or fix any issues going forwards.

Why not Actual Budget, which is also self-hosted, open-source bucket budgeting based off YNAB, however it appears to be a lot more mature.

They also transparently run the project on Open Collective which I like: https://opencollective.com/actual