I don't have a strong opinion on this particular conflict, but I have thought about this in the abstract a bit (and landed on no satisfying conclusion). Basically, I've always been a strong proponent of workers demanding their fair share from a traditional company where the entire game is squeezing employees / society to maximize shareholder returns at all costs. However, I'm much less convinced that the same applies when the employer organization has a genuine nonprofit mission (the thing that actually brought this to my mind was an Atlantic article about how Democratic Party employees were "squabbling" about perks while engaging in a literal fight against fascism). That said, I don't think those employees should sacrifice everything for some "greater good" particularly when the rest of us in society are not--like I said, no satisfying conclusions--just noting the different dynamics.

An organization genuinely dedicated to a mission for common good has even more reasons to share power with its employees in my view

As others have said, there's even more at stake with a nonprofit. Charities famously milk their employees dry by emphasizing what good and important work they're doing, to justify overworking and underpaying them. If someone chooses to work for a nonprofit, that should not be interpreted as "willing to be a human doormat".

Wikipedia owners are free to not have any employees, to prefer employees who donate some of their pay back to the organization, or solicit only volunteers. Workers are free to ask to be paid for their work.