Just use an ad blocker? I've used that wiki loads and honestly can't blame the guy for wanting to try and make a bit of money for his and other people's time and effort.
That said maybe patreon or something would have been a better idea.
But more importantly, he thinks installing open source updates on a community project with community data constitutes a full time job. His guess is that it will generate "significantly higher" than 15k per month and he wants a big chunk of that.
Curating a wiki is not as easy as you think. If anyone can edit the content, you have to be willing to open your site to all kinds of low-quality, off-topic, or counter factual edits. Reviewing the work of hundreds of users to maintain a consistent style and tone can absolutely be a full-time job.
I don’t know if it’s the case here, of course. But there’s a whole lot of “curating isn’t REAL work” shaming going on in this thread.
It's not anything in the neighborhood of a full time job. He absolutely does not deserve to make a living on it.
And when those 100+ users contributed explicitly under a license dictating it not be for commercial use, he doesn't deserve to earn a penny more than his expenses.