What I had publicly available were versions of the Urban Demons mod, versions of my game Cycle, and some unicorn animations featuring the OCs of artists that I like.
Privately I had some animations from the likes of Redmoa, The Count, Batescz, among others. I had uploaded them there so I could download them at a later time, this was done because I was still having issues with my phone at the time. But again, these were private.
The only issues I've ever had with MEGA beforehand was sometimes uploading a megabyte or two over the limit. But I would always quickly delete items in order to make space whenever I was notified of my error.
I don't think this is a cause of people not liking femboy Chilly because I didn't post the images there... I think people just don't Chilly...
If any of the animations you had privately uploaded/stored were posted on the same site and got DCMA'd/removed for copyright then they'd remove every other copy and auto-terminate accounts.
It's a blanket ban/termination that file-hosting/sharing systems will abide to so that they avoid legal issues from copyright holders.
An example:
You store/upload a copy of an animation from a creator that was Patreon exclusive, but don't share it.
Someone else uploads the exact same animation, and shares it.
The creator of the animation DMCA/copyrights the animation that was shared, then the file-hosting/sharing website removes and terminates every and any account that had uploaded a copy of the animation.
Business as usual; to avoid having this happen in the future avoid uploading anything that isn't publicly posted by the creator(s).
You should be able to open another account using another email.