Google Drive, for example, re-encodes in place every video file you upload (!). So I wouldn't be surprised if imgur was doing something similar to combat steganography.
So... you're saying in addition to free storage, I get free computation resources, too?
Do they re-encode PDFs too? (I don't use Google Drive)
PDFs are a funny file format where you can do some crazy stuff... see here for examples: https://www.alchemistowl.org/pocorgtfo/ (click one of the "spoiler" links)
I didn’t know that and that’s kinda annoying. It’s my storage space (which they provide to me for the price my company pays) I should get to fill that with any arbitrary bytes. Why if I stenographically store data as a mpeg that i lose it but if I rename the file .binary i get to keep the data?
Well, you could give them really annoying video formats that they don’t have hardware decoding for…
I mean, in the case of google drive you could also just upload .tar.gz files containing whatever.
It's not like google drive only lets you upload videos.