Its pretty damn crazy how this space is rife for tiny studios of people. They can get away with making one single map, there is zero story pressure. It allows for a $25 or less price point to launch. The infrastructure for this kind of limited dedicated server setup is cheap and easy. And the game type seems to have an absolute pile of hardcore junkies that will tolerate the worst experience known to man because, I think people just want to see a "new map". And each successive game purchase is like a DLC for the previous game - follow me here - because these teams can never refine their game (generally) or fast enough to stay on top.
They have tiny studios, they have cashed out. There seems to be little long term value for the studio to devote much of their blood and treasure after the game goes viral in the community. They've made their money, and they have no long term strategy - like cosmetic shops in Dota/LoL/Heroes/Quake Champions etc - to keep the game fresh and up to date as a purely multiplayer title.
As soon as there is a T1 treatment, with multiple high fidelity maps, sound design, skins/model replacements, private/friend and public servers with leaderboards and robust matchmaking for both solos and groups with a long term business model like other games. I think that and only that will stop the "bad clone" DLC epidemic of this game style.