Agree with such mentions about multidevices. Like hacking about 1000 top android phones - will give you a result, Not sure about mentioning the smart house system, cause its not even as powerfull as phone, but if hackers use it maybe they get smth out of it BTC

Lets take a look from other side. People build monster pc's for mining, and even such powerfull machine needs a lot of time to get a cryptocurrency. So comparing power of  a Phone with a monster PC, guess how much time will it take to get a simple cryptocurrency, it gonna take years, do you need this at all? So, i hope no questions more