Problem of Proton Drive is not only in the missing linux client. There is no support of WebDAV that makes integration with many open source tools (like note taking apps or photo management tools) almost impossible. Nextcloud is much better for me. Without a WebDAV (or one of other popular APIs) it looks like an attempt to create “walled garden” with vendor-lock on Proton, imo.
As I can understand from EFF articles, the problem is not only in MAGA guys and their conspiracy but in KOSA proposal itself.
https://www.eff.org/deeplinks/2024/09/new-us-house-version-kosa-doesnt-fix-its-biggest-problems