That starts to sound like a non-compete, and those were recently ruled illegal unless you know some trade secrets or something (very few people do)

https://www.whitecase.com/insight-tool/white-case-global-non...

Of course, that was the FTC in 2024. Who knows what the administration will change this year?

Sure, I can't talk much about company games I worked on outside of "I worked on this", even after release. But they sure as heck can't prevent me from making a tutorial on C++ in my free time.