Suspect Joe Rogan has also been a fair influence too. His podcast has a massive and varied fan base, and he's a pretty consistent promoter of the benefits of psychedelics.
Tim Ferris donated a lot of his personal wealth directly to this cause and promoted it on his podcast frequently as well.
I think it's just the world. Joe Rogan is popular because currently "Joe Rogan Things" are growing (Weed, fitness, nutrition, MMA, psychadelics). These are all trending.
There's likely a feedback loop involved. Commentators who happen to talk about trending topics become popular; their popular platform can bring those topics to a broader audience; that broader audience stokes the hype around the trend and builds the audience further through (social media-amplified) word of mouth.
It's still rare for a celebrity to be as gung-ho and upfront about drug use, while also being very healthy. Usually drug use and celebrities are mentioned together in tabloids along with calls for them to go to rehab.
For me he definitely made psychedelics from something I vaguely had heard about and only crazy people use into something normal people could use.