Is this happening at any significant rate?
AFAICT this is a fear that some game developers have, that someone will steal their game and run with it, and the stories told are more repeated based on this shared fear than based on realistic scenarios. People repeat it because it’s a good story.
And yes, I’m aware of some situations like 0x10c and the like.
I frequent a couple of game development communities, and it's kind of hilarious that some people won't even talk about their general game concept for fear that others will steal their idea. Like wow, you're making another rogue deck-builder, I have to steal that!
The idea is not valuable, ideas are a dime a dozen. The actual value is in your implementation.
The appstores are full of knockoffs and even resubmitted decompiles. I certainly wouldn't put it past the scammers.
More specifically to AI... A blog on a nice website is no longer a signal for quality so there's just no point in devs investing in that.