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Meh, then you're back to the same dilemma ads have: you have to convince the users to visit your page from a desktop PC as much as possible. And that usually means making the mobile experience as bad as possible. Which the users won't like for fairly obvious reasons.

Why would a miner want to implement that?

So that people don't get angry?

Pretty sure user anger didn't stop the prevalence of pop-up Punch The Monkey adverts. The massive rise in adblocking forced the ad industry to stop being quite so obnoxious.

So, yeah, relying on advertisers to not piss off users is a bit much given their business model relies on interrupting your attention.

No, not even that.

More like: "Is this user's battery below 50% and discharging? If not, he'll probably not even notice this."

Then users would just set their machine to say they're on a slow laptop with 1% battery left.