It's not actually a good idea, though. It's basically just banditry: the cost to the users it much more than the value to the benefactor, and there's not much they can do about it. (to be fair, the super invasive tracking ad systems that now exist have the same problem, but it's not obvious that they're worse).
The doxxing is questinable, but much less questionable than your presentation of events.
Coinhive earned 35% of everything mined on any site, not just the image board. They had no means stopping malicious installations from stealing from users. This provided hackers financial incenctive to compromise as many sites as possible and Coinhive's incentives were aligned with this. The choice on Monero as the base blockchain made it pretty clear what the intentions were.
> Lessons learned: Good ideas in paying for your content needs to pass the outrage culture test. And Krebs is ... not a honest news source.
Don't create tools clearly intended to facilitate criminal activity, make money off of it, and expect every to be OK with it.