Perman sub ban because part of another subreddit

Good for you. It’s important for your self esteem to feel strong and powerful.

In the context, this implies "Ada is solely doing it for the sake of her own self esteem". I don't think so; a simpler and better explanation is that she's building a safe space for trans people, and the sort of people who'd spout transphobic shite elsewhere would make that environment unsafe.

So the situation might look on the surface similar to the one in Reddit, but deep down it's nothing alike:

• Blahaj - the admins are transparently dictating who does not belong to that instance, and that is done so the instance stays true to its goal, by manually removing disruptive elements.
• Reddit - the admins play make-believe that "erryone is welcome here!", then you have mods outright contradicting what the admins say, for a thousand reasons (from the reasonable to the petty and anything in between), with a bot that boils down to "dat uzer posted in [sub], so I assooooome dat the uzer is [whatever]!".

Apples and oranges.

it's important to make sure regular violators of social contract are properly ostracized from communities where their toxicity is unwanted.