Because they couldn't just also move off of the blockchain?
The only advantage block chain provides is you don't have to trust anyone. Eg you don't have to trust GitHub to not delete or modify the repo themselves, but they weren't any part of the problem here.
Here’s some more info on file deletion using git and blockchain: https://chatgpt.com/share/67096e57-d6e0-8004-9f68-ae646bb471...