But that's the thing, I really don't think what you're proposing has anything to do with what google wants to ban. What you're talking about is already possible

But that's the thing, I really don't think what you're proposing has anything to do with what google wants to ban. What you're talking about is already possible using services like coinhive that can be used to embed a miner on your page instead (or on top) of using regular ads. That doesn't require any extension. These cryptocurrency extensions like the one I linked in my previous post are not used to monetize websites, rather they're just a somewhat regular crypto miner shipped as a browser add-on. You don't use it to pay for browsing pages, you use it directly to mine the currency and earn money. It's probably significantly less efficient than a stand-alone miner but it's easier to distribute that way, especially if your goal is to scam people into integrating your pyramid scheme.