I know you can't browser mine BTC, but Unsplash didn't have any XMR pictures

Obviously cryptojacking is a bad practice and should be whole-heartedly frowned upon but what about if you ask permission first?

With the rise of AdBlockers, AdSense and the like are probably falling off as good ways to monetize a website.

I'd love to hear the DEV community's thoughts on the matter. Is this a viable monetization option? Does getting permission first make a difference? Is anybody using in-browser crypto mining and had any success with it? Is it still "malware" if you ask permission first?