I opened my creative cloud account today (after updating to Big Sur) and saw that all of the fonts that I had activated from the adobe fonts website were completely removed from my account. I also had a number of custom fonts that are now impossible for me to access, since my system admin turned off uploading custom fonts apparently (I'm on a student license). Is there any way I can keep this mass deletion from happening again? It is quite inconvenient.
If your system admin turned off adding fonts to Creative Cloud, my guess would be that they have also turned off access to the Adobe Fonts library. You can check this by visiting a font page for a font that's library-only, like Cheee: