"You may not use this SDK to develop applications for use with software other than Bitwarden (including non-compatible implementations of Bitwarden) or to develop another SDK."
Because they aren't focused on just one single service. Bitwarden is a single business only focusing on their password manager, whereas proton has a suite of tools. Passwords need to be stored absolutely in a robust and safe way. I don't trust proton with anything at all, and the proton pass is no exception. The client might be open source, but the backend is not. It's also not as mature as bitwarden.
You switch to Linux. Windows 10 was the last operating system from Microsoft that still allowed local accounts and no wifi connection.
Windows 11 no longer allows that and it requires an internet connection and a microsoft account to use the OS. You might want to use Windows 10 until 2025 and then switch to Linux or get a microsoft account and deal with Microsoft Recall spyware.
KDE Plasma DE looks alot like Windows 10 if the UI is the problem. Or if breaking the system is a concern, get yourself an atomic distribution (VanillaOS, Fedora Kinoite, Bazzite, etc.)
If you are afraid your games won't run on Linux, check ProtonDB and decide.
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