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Then you will be blocked by Twitter and Discord, which is the same thing.

Yeah, sucks, but really should find better places for people to gather regardless, if you're in that sort of environment.

How is this practical advice in a thread where someone mentions that the clampdown happened without notice?

The "shoulda done..." advice isn't useful in the slightest, and I'd argue is malicious with how often it's done simply to satiate a poster's ego.