Earlier quoted context omitted.
I'd say ads are harmful as well, don't see people fighting those this much.
“People does not fight harmful ads for now“ does not mean coinhive should be added to web sites without users’ consensus. And It’s more harmful than ads as users know explicitly whether there are ads on web sites and have a choice to not visit them anymore. But silently mining without warning users of that is worse.
I wouldn't say mining was explicitly without warning, computer fans usually spun up.