[ineedasername]

OSS licenses generally don't have a "leave a penny" type of clause in them.

Writing software under some variety of a free license is essentially a donation. Authors shouldn't expect to get back anything: Imagine a person donated a ventilator machine to a hospital and it saved a few dozen lives and helped out hundreds more. It would seem strange to me if that person was later ranting that the combined net worth of the people helped by that machine was in the $millions and yet they never got any of that money.

That's how it sounds to me when when foss authors complain about not getting paid. It sounds like the subtext is, "If I had known how useful and popular this would be I would have charged for it." Which seems like a strange attitude to have when making something you give away for free in the hope that others found it useful.