Certainly, but when you make a comment or post it gets transferred to all federated servers without your express consent and you currently can’t permanently delete anything.
By that logic though all of Fediverse is illegal and should be shut down. There is significant work to be done there, not just by Facebook but by the Fediverse community on the whole.
Yeah, after reading that I think the defederation was a quite serious mistake on their part that will probably cause a lot of people to abandon their instance.