On: Cancelling Dropbox Pro is hard

[GordonS]

Similarly, I switched from Dropbox to Seafile and have never looked back.

It supports disks, AWS API-compatible blob storage and Ceph and OpenStack Swift as storage backends.

You can also mount Seafile folders as drives using Webdav or a FUSE extension.

I highly recommend it!

Disclaimer: no affiliation, just a Dropbox refugee that's been very happy with Seafile for ~3 years