You have it backwards: The notion that open source developers can not or should not ask for monetary compensation for their work is what leads to their exhaustion and their project's demise.
Of course if the developers don't want to be paid, then that's that. But otherwise, there is a very heavy atmosphere in the open source community of excommunicating anyone who dares to ask for payment as heathens of the vilest order.
> there is a very heavy atmosphere in the open source community of excommunicating anyone who dares to ask for payment as heathens of the vilest order
I fully agree that forcing payment or using dual licensing is unfortunately heavily frowned upon. But a voluntary Patreon/donation option is perfectly acceptable to the same anti-payment people.
Of course if the developers don't want to be paid, then that's that. But otherwise, there is a very heavy atmosphere in the open source community of excommunicating anyone who dares to ask for payment as heathens of the vilest order.