If an instance isn't defederated with another instance, it can talk to it.

You can see which instances an instance defederates with yourself. For lemmy instances, it's at /instances. Just check each end.

So, for example, I'm on lemmy.today. http://lemmy.today/instances doesn't have lemmygrad.ml in its Blocked Instances list (it doesn't defederate from anything, as a matter of policy, in fact).

https://lemmygrad.ml/instances doesn't have lemmy.today in its Blocked Instance, so it isn't defederated on their end either.

Ergo, they can communicate.

Pretty easy to check a pair of Lemmy instances for that.

All that being said, though, if you want to create a series of throwaway accounts to argue with them without them banning you, I think that both you and they are going to be happier if you two stay away from each other. It's just not worth your time, and I think that the chances of there being a productive outcome for you or them isn't very high.

My instance federates with everyone and is very stable. The owner has posted many times that its not the job of the instance owner to control opinions, which I heavily agree with.

Obvious trolls gets kicked out but generally people are encouraged to have opinions and discussions. I think its a great instance.

There is a signup but that was only added because spammers made it necessary, not because the owner wanted it.

mbin its pretty great.

https://fedia.io/

Sorry, comrade. One doesn't simply attend a Comintern meeting without approval.

You must fill out the application and wait to be accepted, that is, if you even qualify.

In Soviet Russia, you do not chose the party, the party choses you!

~/s~

Maybe commenting will help me...