Meta can have the data, that part yes you consent to by using ActivityPub software, though there is a whole other argument to get into later about whether "normal" users really understand that. But no Meta absolutely cannot process that data, for creating shadow profiles or anything like that - unless the user explicitly opts in. GDPR is quite clear that you cannot infer that a user agree based on some other influence (in this case the user using ActivityPub) - the user MUST have been presented with a dialog explaining what Meta would do with the data and giving the user the option to say they agree or disagree with it.
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