Thousands of sad frogs, wojaks and other memes. The fringe fashwave music videos. Greentext stories with their weird rules as whole new literary genre. It's obvious there are real artists spending days and hours making them, but posting any of these things on mainstream cultural outlets gets you banned. How this is any different from independent filmmaker being shunned out of cinemas for his extreme take on coprophilia in the 80'?

Basically all memes? Pepe, Wojak, Soyjak, the Bogdanoffs, etc.

I'm strictly considering the definition as "an alternative to dominant [as opposed to popular] opinion and social mores".

I'd probably agree the bulk of indier-than-thou creations are produced by people on the left (not all of whom demand we also bow to their political interpretation of the world); some of the work excellent, most of it perhaps not.

How many symphonies did the hippies compose?

Like gays in the 50s, conservatives in Hollywood (and at big tech) are careful not to out themselves. Given that Hollywood has lots of wealthy, business oriented people much of the media you like was made by conservatives without you knowing.