I certainly don’t deny your point about Youtube. Their algorithm could use some work, and a lot of folks have been pointing that out for a while now.
I also don’t doubt the existence of the study you cited, or that the alt-right side of Youtube has had a measurable impact on younger viewers; there are plenty of legit alt-right “gateways” and influencers on Youtube and other websites, and they’ve had a lot of practice at using social media as an outreach tool to attract new recruits.
But I still do indeed deny that Rogan’s podcast is a gateway to the alt-right. He has had hundreds of different guests on his show over the last decade or so, and the vast majority of those guests aren’t even in the business of politics, let alone involved with the alt-right. Most of them have been comedians, MMA fighters and enthusiasts, musicians, and a whole bunch of Rogan’s personal buddies. He gets a lot of dieticians, nutritionists, and other health experts, too.
If you’re just a regular fan who listens to his podcast on a routine or semi-routine basis, you’ll have to go through quite a few episodes before you encounter any of the alt-right stuff. And the number of genuine alt-right guests he’s had on his show is really very small — I’d probably put the total number at a dozen or less (Candace Owens, Milo, Gavin McInnes, Chuck Johnson, Alex Jones, and maybe a few others I can’t think of). So in my opinion, if you’re a regular Rogan listener, the only conceivable way you could expose yourself to a heavy dose of alt-right politics without also being exposed to a heavy dose of contradictory viewpoints along the way is if you only tune in when has an alt-right guest on. And if you’re only tuning in to hear his alt-right guests, then I’d say that you had already made up your mind about the alt-right long before you started listening to his podcast.
This is already too long of a comment, but I’ll throw this out there real quick because it might be relevant. I do not think of Ben Shapiro, Steven Crowder, and other diehard, traditional conservatives as “alt-right.” You might feel differently. I also don’t consider Sam Harris, Bret and Eric Weinstein, or Jordan Peterson to be “alt-right sympathizers.” Again, you might feel differently. And if you do, that could be another source of our disagreement that we should probably take into consideration.
Alternatively, we could just agree to disagree. I feel like we might be talking in circles at this point, but I’m happy to keep going if you have anything more you’d like to add!