Fun stuff you can do with the #GoToSocial domain permission subscription feature (once it's in a release anyway, it's just today been merged into main):
If you wanna subscribe to a block list but choose which entries you actually enforce you can do that like this: https://docs.gotosocial.org/en/latest/admin/domain_permission_subscriptions/#3-subscribe-to-a-blocklist-but-ignore-some-of-it
If you wanna create an allowlist federation cluster (like a mini self-contained fediverse) where each instance auto-updates its allow list from a cooperatively managed source, it'll be very easy to do this too: https://docs.gotosocial.org/en/latest/admin/domain_permission_subscriptions/#1-create-an-allowlist-federation-cluster