I'm currently using google drive with rclone mount for a plex library and most days it works great but once each 2 weeks or so when the stars align and im doing a backup, there is lots of plex activity and new media added to library, I'll hit the daily api limit (not the 750GB/day but in API calls or whatever) and the plex server will be effectively offline for a day or so. Not a huge deal but its a bit annoying.
I've been thinking about giving jottacloud a try but I know lots of others have tried already so I figure the answers may already be out there.
I'm aware of the upload speed limitations and I think I'm OK with that - I only have about 5TB of data - the biggest issue I seem to have is the number of api calls the plex server is using per day when scanning libraries and whatnot.