Q: How does a community get verified?
A: Some of the factors that would be considered (but won't guarantee verification) are as follows:
(1) Good moderation and leadership.
(2) Frequent activity from many of its members, not just a few.
(3) Having a friendly and inviting atmosphere.
(4) Filling an interest that is unique and highly desired (i.e. not already being filled by another community), and/or being the main hub of a very popular topic (i.e. the Mario community).

We have the 4th one and the 2nd one, but not the 3rd one and (Maybe) the 1st one