I switched from dropbox to mega years ago when the former removed Linux support. TIL mega have version support so I need to enable that and try it out.
First thing I do on a new device is setup my mega shared drives - and there is a lot of plaintext files there!
Dropbox never removed linux-support at all, or sync specifically. They removed support for some esoteric filesystems which lacked certain features. For most people dropbox on linux did not stopped working.
Google docs has a similar feature built in too I think.