This command will enable or disable STATS requests by users. Network operators can still see stats.
/as security set stats on
For the most part non-operators do not need to see stats. They may find some of them useful or interesting, but they should be able to get by without them. Disabling them can be useful since they provide information, and some users may try to use that in ways you dislike. Particularly by listing bans they can try to find ways to evade them. Restricting stats to network operators only may make your server somewhat more secure.