I mean, this indie developer sold more than lots of (most?) AAA studios, and AAA studios have a lot more operating costs than an indie. Donating one dev year is a lot easier when you sell 50 million copies and hire no one than when you sell a couple million copies and have 100 employees plus investors. (I have 3000 hours on this game, so definitely not biased against indies or something.)
These studios have profit margins in the multi-millions, they could afford a symbolic $100k donation. Instead they choose to push their developers through another crunch cycle.