When Gokanaru made his video on H3H3 he said that "conservatively" Ethan was making at minimum 20kUSD per podcast. That includes the long winded 10+ minute ads for sponsors, pre-roll ads, affiliate links, paid subs, donations, and the pre-roll ads on the clips channel. He talks about the podcast money at 52:33.
https://youtube.com/watch?v=2t5v5S0UuOg
Then take this into account...
I'm guessing kids and teens are too stupid to install adblock. And I don't know how so many kids are able to obtain their parents' credit cards to make donations, but I've seen it happen. Teddy Fresh might be making a decent chunk of money, but it's not what paid for that mansion.