Those programs like that, Plex, Embry ect. (unless carefully configured) can be unintentionally EXTREMELY taxing on your drive API and quotas.
The reason is that they were all designed to talk to regular harddrives, so many of them scan the entirety of every file to collect a lot of data (which is not a huge deal on local HDD, but is on a cloud remote) - so you may literally be downloading your entire archive unless you set your settings carefully. I would certainly recommend against automatic scans except for the most basic detection of new files.
If you did hit a specific-file quota then the other option is you could have hit the general download quota, which so far there seems to be a great deal of agreement is 10GB/day. You certainly need a lot of bandwidth to even be able to reach that quota - but it is possible. (if this is happening it should be really obvious from your bandwidth utilization and your Google metrics for the period)
I do not use jellyfin myself so I can't help with configuration of that. Animosity may know about it, you could try asking him for rclone-spesific tips for scan-configuration. He uses Plex mostly I think, but I wouldn't be surprised if he knows about alternative software on Linux - I assume this is on Linux.