What Caused MultiVersus DownFall.

Today, the final season for Multiversus dropped, and when it ends on May 30th, the game no longer be online or available to download (for those that don't have it yet), and for those that do have it, it will become a regular fighting game, with all the characters included as part of it.

But what cause this to happen? And what I believe they could've done in the first place to prevent this.