There are a few posts on Reddit about Jottacloud, I think I’ve seen one on plex forums as well. However nothing really fresh or conclusive (especially that they played in the meantime with the 10TB limit). Also rclone works only since recently so they didn’t have time to react to people bringing loads and loads of files there.
Only time will tell but it annoys me this crazy marketing - clearly there is some point where they don’t want you as customer anymore. So put a limit there and get rid of all the customers that can cost you money. What is the trouble there, will the other customers be scared too? Will somebody who wants to store 2TB not come to a service advertised as 10 TB but will come to one advertised as unlimited? Or will they feel obliged to fill all 10TBs while if you leave it unlimited (which we all know means unspecified actually) they’ll just be happy to take 2TBs?