To start, Jon Jafari has a rich Iranian father from California and a mother from an ex-Sovietstan or ex-Yugoslavia country. Look at all the old yahoo questions shit he did years ago, and the big house he lived in with his parents in California.
But, he also made a shit-load off just JonTron and GameGrumps. When he moved to NYC, he was getting deals with Disney and FlexTape and infamously Raid: Shadow Legends. That adds up when you’re hitting 10mil views per video. Safe to say he makes residuals. He was also pretty close with Ethan Klein and his circle at some point too, where he could have provided resources. He’s also buddies with Internet Historian, which is another network.
Check his twitter, his official business contact is through Ellify.
Ellify is a Vancouver based YouTube talent agency that employs several other YouTubers (none I recognize other than Xiaoman).
They’ve done work with all the usual suspects, but also Warner Brothers and Sony. Interestingly, they don’t list Disney or Raid: Shadow Legends (Plarium, who are Israeli and owned by an Australian slot machine manufacturer) indicates that this partnership is relatively recent. Maybe it’s a recent contract for his own business, maybe his business didn’t pan out and it was taken in and that’s why he’s uploading somewhat more frequently, or maybe he cut a good deal behind the scenes.
I checked the IMDB, but didn’t see much for anyone involved in JonTron as a jumping off point.