It wasn't announced because there were no plans to pass the development to another team. Now the game is under a different company and we all got the chance to move for free for a limited time. It's quite normal that they want to earn from the product they brought. The need to move to Steam was written literally everywhere, even in the in-game launcher. And that's just a pic of a development newa. Actually, ISI stated they were going to focuse more and more on the Steam version since the patch released in May 2016, so people had EIGHT months to move to Steam (which really was a no-brainer, considering that Steam is the reference platform for any game on PC). As our development focus will shift to the Steam version of rFactor 2 over the next few months, we recommend users convert their copy of rFactor 2 to Steam to fully take advantage of the new features as they become available. Also, you should also see it in a different way: without S397, the sim would now be dead, as such the result would be exactly the same. With the only difference that now the sim can still go on. Really, just wait for a Steam sale and you'll be able to buy the sim again for 15€, I don't see it as a tragedy.