Honestly?

It's probably because he may have felt too "boxed in" with regurgitating liberal or even (at times) conservative politics.

There's probably some "vain rebelliosness" in there, but also, a sense of individualism and thorniness at having to pay lip-service to certain talking-points that nobody either explained to him or that he feels impedes him from saying whatever the hell he wants.

And honestly, a lot of creatives, influencers, media personalities, etc. are unfortunately like that.

It's not a good thing because it's not only done for the wrong reasons but it's the end-result is pretty bad, imho.

Edit: This is to the question "Why is Joe Rogan right-wing?"