Not a bad new at all, it is only common sense.
You cannot do real mining from a phone without destroying the GPU and the battery.
Agreed. I don't see it as bad news. Electroneum's mobile miner is not real mining as it is a simulation / experience that works more like an airdrop (I am sure it uses less battery than Apple's own FaceTime which definitely does not "use power efficiently" as it drains the battery too quickly). So technically ETN's app is not breaking Apple's App Store policies. If the issue is with the Mobile Miner name, they could always call it Electroneum Mobile Experience.
I have always seen the Mobile Miner as a marketing tool, and I could live without it in the iOS app. I am more interested in the other things Electroneum has to offer, like the recently announced instant payment vendor app (beta), the partnerships, etc.