I am unaware of any javascript function that can monitor system resources, I strongly doubt the low usage claims. This is basically a client end web based botnet, it's probably legal but definitely unethical.
Bitcoin is an unregulated financial market, the only reason anyone uses it is because of that. Due to its major use in money laundering, illegal financing and illegal purchases the writing is on the wall; regulation is coming. It's also unreliable, they were recently hacked and lost almost half of their users funds.
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