@Gargron From what I have been observing it seems that the decrease in Gab's user base has accelerated since the launch of the purism.one instance, which is probably why Masto got their attention (if you can't beat them join them I guess?)
They seem to be trying to imitate certain aspects of purism.one as a response to this churn.
Not sure a preemptive domain block is needed for everyone...if no local user interacts it seems they naturally don't federate with you.
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