@lanodan @davidrevoy @ariane @duponin Agreed, but then it's not a concern with Meta, technically they could retrieve all the public data they want with an accounts on big instance and start playing with the APIs.
I suspect that many people freaking out about Meta have no idea of the big privacy issues intrinsic to ActivityPub, at least I know that Meta do not care about my activity since they can't monetize it. I'm not so confident about those rogue or badly maintained servers.