Git already has a blockchain; what you will need to do next is to make copies of the objects of the repositories on other servers as well. (However, I don't know if the blockchain includes tags on git (it seems to me that it might not but I don't know enough about it), although it does include objects. Fossil includes tags in the blockchain as well as files, commits, etc.)

I mean, torrenting is decentralised and not technically takedownable. But it was entirely possible to make it legally painful for people involved in it, as seen in eg. The Pirate Bay, megaupload or an entire cease-and-desist letter industry around individual torrenting users

Intentional noncompliance with copyright law can get you quite a distance, but there's a lot of money involved, so if you ever catch the wrong kind of attention, usually by being too successful, you tend to get smacked.

The cost would be incredible even for just a pointer to distributed file storage

Yes, using blockchain to defraud the GPL.

Checks out sufficiently dystopian, yep.

If you could work some gratuitous LLM in there, we could be a little closer to torment-nexus territory. Keep working at it.

git already uses a blockchain lol