OP sounds like they're honoring the terms of Wikipedia's content license and donating money on top. Why is that a problem?
They're presumably also benefitting from the work volunteers put into Linux, nginx, and whatever else is in their stack, but nobody suggests that websites using open source technologies should be forfeiting all profits.
They're presumably also benefitting from the work volunteers put into Linux, nginx, and whatever else is in their stack, but nobody suggests that websites using open source technologies should be forfeiting all profits.