Comment by osigurdson

Developers can always contribute as well but the benefits aren't really accruing to them. If open source libraries didn't exist there would be commercial offerings or things would have to be built in house. Also, $100 / year / dev is a rounding error and would add to a company's engineering brand.

It seems like a win / win to me but, of course, no one has to do anything at all. Just don't get upset when maintainers pull the rug out from under you because that is the behavior that is being incentivized: 1) make your thing widely used and hard to replace, 2) get in to large companies that can afford to pay 3) change license, pull rug and get your legal team ready to fight.