I thought it was good to see to be honest. None of this just conjures itself out of thin air, and it'd be worse if they had no other way to get money except sell out to some corporate entity.
Some people don't even think about donating, not that they don't want to but it hasn't even occurred to them.
A gentle reminder on occasion is completely acceptable and uses no dark patterns to get you to donate.
Subsidise home battery systems so that the excess is stored locally instead of going back into the grid.