Just curious, how could Meta EEE in the case of the fediverse/ lemmy? As in, technically how does them joining as an instance affect others whether they're blocked or not?

And what advantages would there be to preemptively devederating instead of waiting or leaving it to users?

I'm kind of hoping Threads can lend credibility/ momentum to the fediverse so if I'm missing something about how they could negatively impact it I'm earnestly interested.