Lemmy.ml has now blocked threads.net / Meta
(lemmy.ml)
It should come as no surprise that the lemmy.ml admin team took about 2 minutes to decide to pre-emptively block threats / Meta. Their transparent and opportunistic scheme to commodify the fediverse and it's users will not be allowed to proceed.
We strongly encourage other instance administrators to do the same, given the grave threat they pose to the fediverse.
That's correct. And you as a user of lemmy.ml, when you set your feed to 'ALL' it won't show posts or communities from those instances. But if your account is on lemmy.world, you would see them. You can also personally block any community you want. I don't think you can block certain instances on a personal level, could be wrong though.
You cannot block whole instances as a user as of now. It might be a feature in the future. If someone wants that, they can go have a look at Lemmy's GitHub and open an issue for adding this feature in case such an issue does not already exist.