Talk about having the umost integrity to avoid being remunerated for it, not because of the potential corruption it could lead to, but to even avoid the appearence of potential corruption.
He's a FOSS Saint.
One of the projects I'm a maintainer of does the same thing. I am very strongly against donations because it can create an unnecessary burden on staff and an expectation by players that we don't want to have happen.
They would have to download & install this
https://www.getmonero.org/downloads/
They could also watch videos from mental outlaw about monero.
Using it and reporting problems is what anyone can do, hopefully someone able to file a proper bugreport will come along.
No one is worthless