The two main typefaces are Knockout and Gotham, both being fonts from Hoefler & Co. — formerly Hoefler & Frere-Jones (H&FJ), until Jonathan Hoefler allegedly never gave Tobias Frere-Jones the equity stake he promised, eventually calling him just an employee[1]. Not only do I think is Hoefler & Co. a terrible company under Hoefler's leadership for that unethical move, the company has refused for the longest time to su…
ideologically, i agree, except that HFJ/H&C produce some amazing timeless typefaces and it's really hard to ignore that.
For example, I run a forum with a million daily page views. If I wanted to use Gotham, I need to pay $150 for the font, and then subscribe to their cloud service and pay $450 per month for that amount of page views.
I might be willing to pay a one-time $100 fee to use one of their fonts, or a $100 per year subscription to use any of their fonts. However, $5,500 a year for my site? That's almost as much as my servers. It's a laugh, I'll stick with the well respected free web fonts.