Basically, the devs of Subnautica 1 were working on Subnautica 2 but got bought by another company- Krafton. Krafton promised a very large bonus to the lead devs assuming the game was released by a certain time. They were on track to meet that deadline, but Krafton was insisting the game be delayed and when the developers resisted that they got fired. Now the people that were fired are suing saying that Krafton fired them to avoid paying them the bonus rather than for cause.

I might have gotten some details wrong, I’m not following this incredibly closely myself.