Every fediverse site can interact with each other; so to ban interacting with lemmy.ml; you’ll also need to ban the entire fediverse; not to mention the oncoming new fediverse capable sites. Pretty much a piracy hydra situation but each head can be linked to each other, with the exception that fediverse sites hosted on India might not be able to reach the sites banned on India.
If lemmy.ml gets banned, you can still follow communities there using another fediverse site like lemmy.world or mastodon.social.