Is “ERC-6551: Non-fungible Token Bound Accounts” similar to how ActivityPub and alike protocols work?

Trying to wrap my head around the concept of this proposal, but it seems to me that it is trying to resolve that sense of "interaction" and "ownership" of a singular entity with N implementations. Where any site (implementation) can allow a token based account to interact with it. Despite having a "NFT" that denotes/symbolizes the user account was created on it? I guess.

Also would interactions with implementations still have high gas costs (or any)?