Are there really more? Some similar projects like Monotone and Bazaar are no longer being actively/regularly developed IIRC, and the number of hosting services for something as well-known as Mercurial has been dwindling.
The result is that I happily keep using Mercurial locally even when collaborating with people using Git. I don't see the need to have Mercurial specific hosting. (Well, until Bitbucket finally starts working with obsolence markers so I can use Changeset Evolution).