Not sure about that. Even if .ml was open to new signups, there are quite a few reasons people would pick .world over it:

1. .ml goes down more often than .world
2. .world allows non-nudity NSFW content, while .ml does not allow any NSFW content
3. A lot of people have concerns about “tankie” ownership of .ml (whether that’s true or not), while the owners of .world seem more politically neutral

I got in before signups were closed, and have accounts on both .ml and .world, but have abandoned my .ml account for the above reasons