Offering the source code of a project to the world is extra work and an act of kindness. We should reward it in kind.

We should have the option to reward it. We shouldn't be harangued for not.

Disclosure: I maintained a well-used piece of software for about 10 years, and contributed to other projects as time permitted. I never, ever, wrote a single line of code or email expecting money for any of it. I went into it as a spare-time thing and I stopped when that ran out. I have no compassion for people who just magically expected a wealth of ready donations for whatever they produce. It's entirely naive. It's like the beggar yelling at you for not dropping a twenty into the cup.