Business or not, there is still the community aspect to it that keeps people interested. I don't think anybody was trying to equate moderating here to charity work like serving meals at the food kitchen, but I suppose I understand your point.
I post at a BMW auto forum called Bimmerfest. That forum was started years ago by a BMW salesperson from Santa Barbara CA and he was active in the forums. In the last couple years he retired and participated less and less in the forum, then recently sold the forum to a Canadian company called VerticalScope. They brought in their own people then moved the forums to Google Cloud with really poor results. They also recently closed their politics forum and handled that poorly IMO. From what I can see, forum traffic is way down and a lot of regulars have stopped posting since the feeling of belonging to a community of like minded hobbyists is diminished. To your point, if MacRumors took a similar "corporate" path like Bimmerfest did, I think I would see things like you do, and I would likely stop being a moderator. For now, I see the MR forums as a hobbyist community where the owner is making some money, not as some corporation raking in money that should be paying moderators.
It's funny vertical scope killed jeepforum, but it does just fine with wranglerforum and pirate4x4, most of the Jeep community is a member of all three.
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More to the point mods make or break a forum OCN was a great place for PC stuff until it was sold and the mod crew got changed it went from fun community oriented to walking on egg shells and corporate within a month. Online tech forums have in essence replaced the user groups of old and it's important that they be part of the community and enthusiasts themselves since there is no IRL replacement.