Oh wow! Do you know if their employers pay them to work on it on-the-clock (how much of their job?), or if it's actually a s spare-time/hobby project for them?

Oh wow! Do you know if their employers pay them to work on it on-the-clock (how much of their job?), or if it's actually a s spare-time/hobby project for them? This kind of traditional way of getting paid while working on open source (a company pays you a salary to work for them, you work on open source in some of your time, you don't make money from the open source) sometimes seems like a thing of the past for big/popular projects, interesting to see it still in play here.