Mainly because of the lack of competition. Up until last week only one person had actually completed a run of the category and it didn't look likely that that number would increase any time soon. This week it actually has increased to 2 (maybe 3) but we're not really sure about changing the status of the category just yet.

Any% is also simply just "Beat the game" - the most basic and for lack of a better term 'official' category out there. Almost every game will start with this as a Main category. 151 is and of itself a made up ruleset to complete an optional task - it starts as Misc and gets advanced to a Main category after several stipulations are hit (one of them being activity)