I left Unity behind they they merged with Ironsource. I said it then, that they would become an ad focused company and engine development would be put in the back burner. I've watched that statement become the truth.

I left because even before that, they kept over promising features and then depreciating things and leaving users with broken systems that you either had to wrap up in boilerplate code yourself, or pay for an expensive plugin to make work right. When they MERGED (the article says it was an acquisition, but in reality it was a merge. Subtle seeming difference, but an important distinction for me), I saw the writing on the wall that this trend was only going to get worse. And it has.