Makes sense for a tailist org like DSA

Why are people still predominately on twitter?

Because that's where the posts are.

Everyone here on the fediverse has at least a foot out of the door from twitter and should take the approach of not linking back into it. This is why the side bar has that as a rule though it is out of date (the login requirement is a countermeasure taken by twitter to break nitter, proof that this approach is working but now we need to move to actually rehosting videos and not just using front ends).