I stick with Dropbox for the Linux support. It is fantastic. It works on servers, with no GUI, so I can easily sync stuff from my Windows Laptop and my Linux server, where I perform scientific stuff.
I also pay for SpiderOak cloud storage but they don’t allow selective sync - you get everything mirrored on your laptop.
That said, Google Drive and Microsoft OneDrive are still useful on Linux laptops through the web app.
We're also the only set of users that will actually saturate the oversold storage while still burning through that $2.50 worth of customer service with a single question prefaced with "hi, I run Linux."
Apple:
50GB for 0.99
200GB for 2.99
2TB for 9.99
Google:
100GB for 1.99
200GB for 2.99
2TB for 9.99
Their IRC channel is no help in debugging. Disabling all apps doesn't help, looking at the php & syslog don't show any errors, and adding caching only saves a few seconds of rendering time.
Nextcloud has seriously lowered my standards for bad PHP projects, making most others look well written and decently documented/debuggable.