Theoretical scenario so in the future we can't be hit by a giant wave of DMCA takedown requests for things we don't manage. We're already a relatively small team and can't add the legal workload of a bunch of other sites. (If an instance complies with it it lessens the work we have to do since then the deletes get federated over) If it becomes a problem with some other instances we can purge their communities or defederate at worst case if its instance wide if they don't want to manage it but burggit explicitly says in their instance description DMCA ignored while others dont