[1] The Standard Pro License is perpetual, meaning that you'll still have a license if you don't renew your paid plan. You'll retain access to the last version available when your plan was active.
Having this in mind, I think that FA has found a very nice equilibrium between paid and free.
Back to bootstrap, I'm impressed by their work, and this addition is yet another confirmation that the bootstrap team is awesome (pun not intended!)
https://www.kickstarter.com/projects/232193852/font-awesome-...
I guess I never really noticed in the corporate world because my old company would just pay the modest price for icon licenses, but on my own, I find myself a bit more weary to purchase a $99/year subscription just to play around with some of their nicer icons with my personal coding projects.
On the other hand, I do appreciate all the free icons they offer and how easy it is to access them!