A one-time[1] $99 fee for all of their icons is not greedy. If you had to do that work yourself you would spend a lot more just in your time alone.
[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.
I do agree that getting all the awesomeness of FA for free was better, but I think that we have to agree that the quality and the scope of the project involved (and still involves) a ton of work. So it is just fair that the developer(s) of such great work is (are) remunerated for their time spent on the project.
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!)
You're being downvoted, but I find myself mostly agreeing with you -- FontAwesome was much more open and accessible in the early years, but have now been monetizing presumably rather successfully after their $1m+ Kickstarter campaign:
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!
[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.