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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.

No, not even that.

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

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.

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