Yes, but according to the article, Mastodon only has 35K users at the moment. The question is how they're going to enforce this policy when/if it reaches Twitter size (hundreds of millions of users). When armies of trolls show up making hit-and-run accounts, that's going to be hard to combat.

Then again, Twitter has been notoriously uninterested in fighting this kind of problem. In fact, they don't seem to care much at all what their users think (editing tweets, anyone?), probably because users are not a direct source of income for them (but advertisers are). This is different in the case of Mastodon. It would be interesting to see what kind of solution they might come up with.