Because it shows that a sizable amount of people are at least anti-nazi enough to move platform.

Yes, it would be nicer if they moved to mastodon, but nobody even knows what that is, nobody is there (classic chicken and egg problem), and people get confused by the whole “choose an instance/server” thing.

Is it not ok to have a small celebration of people moving to a better, more positive platform, even if it is far from perfect?