Personally I put myself on the waitlist when I first heard about it way back when but still haven’t gotten one yet. But instead I’m not interested now that I’ve figured out Mastadon and lemmy, where I get the twatter and reddnot experience while also being able to federate between the two.

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The only reason I can think of is to generate hype and false scarcity

It has to scale up, so they add users slowly. I don’t know how to get an invite really. Occasionally someone I follow will give away an invite but I haven’t been lucky yet.