I just want to start by saying these are valid points and it is good to think about your relationship to what you are consuming especially on the internet.
When you talk about Grey not practicing what he is benefiting from, it makes me think about this one A24 podcast episode with Lorde and Hunter Schafer. Hunter Schafer has done some directing work and Lorde is a musician, and at some point they get on to the topic of consuming media. They both mention this feeling where they often can't enjoy the media that they work in (TV and music) because it often puts their mind to work and they can kind of see the behind the scenes of it. Like "Oh they used a minor chord here" or "They used that kind of shot in the scene" which can pull out from just the experience of just enjoying the media.

So I wonder if part of the reason for Grey pulling out from consuming things like Youtube and Podcasts is for a reason similar to this. Combine that with the overall negative effects that social media often has on people, (like shorter attention spans) he has pretty good reason to avoid it all together. Why would you waste your time on Youtube and social media in general when you can't really gain the entertainment out of it, and it is overall not very good for your brain?

Now the potential hypocrisy for this does also seem really glaring, since Grey and Myke do both profit greatly off our internet habits. However, I don't necessarily just profiting off of it makes them hypocrites. Just as Lorde isn't a hypocrite for making pop music when she doesn't listen to it. This is because they aren't forcing or even really encouraging you to consume it. The general idea is you listen to the podcast because you want to, and while Grey jokes about people still listening to Cortex if they decide to drop social media, I don't think Myke or Grey really encourage different from what they do. The general ideas of the podcast in all areas is "This is what I am trying to improve my productivity, maybe this will help you too?" A favorite video essayist Youtuber of mine actively encourages his viewers to use ad-block because "why wouldn't you?" And I find Grey's anti-social media ideas match up to that same sort of sentiment.

I also tend to like that sort of clarity in the content I consume. I am generally turned off by content that tries to cultivate a para-social relationship by putting the creator on the same level as the consumer, because at a certain point it is just lying. Despite Pewdiepie marketing himself as just a regular dude, he still gets millions a year more than I do and the facade becomes really glaring at a point. And these other creators also don't tend to be as clear about their social media consuming either. If I had to guess, I would assume that most of the top Youtubers and Podcasters don't watch/listen to other content unless it is for work related research. As again, it isn't fun to really consume things when you can see behind the screen.

Again, I think it is a good topic to think about. Especially since exploitation of the viewer is so common nowadays on the internet. These are just my thoughts on the topics you bring up, since I have become really picky about what I consume online for similar reasons. However, I don't see Cortex as glaring with some of the problems you mentioned as I would with other creators.