Wikipedia and Mozilla were at one time mainly Non-Profits that people volunteered at for the same reason people volunteer at other non-profits, to benefit wider society

Both are turning more and more to be more profit-seeking, (Mozilla more than Wikipedia ) and it is tarnishing their reputations

SE has always been a for-profit business, this makes Volunteering more like Free Labor and less like "doing something good for humanity".

Generally speaking, I do not believe For-Profit business should be allowed to seek Volunteers for their labor, this includes SE, Reddit, etc

If a business model can not pay for labor, then it needs to be a Non-profit Foundation, not a for-profit business