This person should be funded in a level that is appropriate for how critical log4j2 is used in the ecosystem. There is no excuse for this. This person's spare time passion project is responsible for half of the internet working the way it should.
TL;DR: If you want me to make you useful software, pay me. If you use software made by others in their spare time and find it useful, pay them. This should not be a controversial opinion. This should not be a new thing. This should already be the state of the world and it is amazingly horrible for us to have the people that make the things that make our software work at all starve and beg for donations.