Since I have some free time now I watched the cb front page often. Yes, there are tons of unusual rooms that pop up with hundreds of users after only a very short time of broadcast for no apparent reason. The "user" names that push these rooms are always the same, light blue users.
Apart from more visibility to casual bypassers, there is a second effect that came to my mind in the night. The list of the followed rooms of the users is sorted in the same way as the cb page, by number of registered viewers in the room, so these room also shoot straight to the top of the "followed" rooms of the cb users further increasing visibility. If the followed list is long enough, this can have a big effect too, might even outweigh the appearance on the front page for girls with many followers.
Apart from more visibility to casual bypassers, there is a second effect that came to my mind in the night. The list of the followed rooms of the users is sorted in the same way as the cb page, by number of registered viewers in the room, so these room also shoot straight to the top of the "followed" rooms of the cb users further increasing visibility. If the followed list is long enough, this can have a big effect too, might even outweigh the appearance on the front page for girls with many followers.