Serious question, did you even read the page? Specifically, the part where it makes specific complaints about the 2019 .org registry agreement, such as the ability to raise registration fees without ICANN approval?
Then there are people like me. My org domain is so old it can legally drink and soon be able to run for Congress. What is it worth to me? $200/year? $500? $1,000? I don’t know and it sucks to have to consider yet another astoundingly high cost of “living” in a world that keeps going up in cost.
In the aggregate, that's many, many millions of dollars going into Ethos Capital's pockets at the expense of charities and other non-profit organizations.
Who says it stops at $15, too?
They could charge x.org $15 and y.org $150,000.