I don't understand why they don't just ship a huge set of fonts by default. I'm probably missing some licensing bullshit, but look at Google Fonts and all the amazing fonts there. They're called open source fonts. Is there anything stopping firefox et al from just bundling them, or at least downloading them on-demand from a trusted server (not google)?

It would be lovely if all web developers could just assume that the entirety of google fonts is at their disposal in a native way without having to resort to webfonts and the overhead that brings.