Recently I switched from the Boxcryptor Mac version 2 to version 3, as advised.
Currently, I am experiencing some serious issues with Boxcryptor, among them: The Boxcryptor folder is detached from the underlying cloud folder (OneDrive), as a consequence, the files in Boxcryptor do not sync at all and the files will be lost once I reinstall Boxcryptor. Also, I experience a lot of app crashes and error messages.
The support silently acknowledges the issues and promotes going back to version 2, which has its issues on its own. See https://www.boxcryptor.com/de/blog/post/new-boxcryptor-for-macos/
It looks like, even if Boxcryptor offers its services until 2025, its software won't receive updates anymore and the issues will make their service unusable.