Mutahar (SomeOridinaryGamer) is... possibly? probably? ... the most popular youtuber who regularly uses linux, games on linux, explains to people how to do so, has come up with many of his own methods and tutorials.

He does a whole bunch of other kinds of content, but he functionally serves as a linux evangelist for pc gamers, with general appeal.

He's been gaming and daily driving linux for ... probably half a decade now, starting to do so back before Proton really started to take off.

Mutahar's initial exploration into, and then just casual usage of linux for gaming, has probably/possibly done more to normalize amd destigmatize the idea of gaming on linux than any other youtuber I can think of.