I used nextcloud for a year or so, but found the web GUI/apps slow, bloated and sometimes way to buggy ! Switch to owncloud for the simplicity of only having a cloud system without to much bloat.
I just read through the seafile documentation and yeah this is also not going to happen. Maybe I should switch to a simple webdav server…
As long as they continue to maintain the github repository and keep it free without any hidden ads/spyware or restrictions, I will continue to use their service.