While I agree that many FOSS devs/maintainers would find donations and other monetary support very useful, please remember that money isn’t the solution for everything. This is especially the case for mental and emotional wellbeing. Funding might increase the entitlement and demands of the users on the maintainer’s time. What the maintainer really needs might be some time off or reduction on their workloads.
I’m all for donating to these projects. But don’t let that be an excuse to treat them badly and make unreasonable demands on them.