@Skullfisher there was someone in our telegram group that was doing a similar thing with a wfii network. They had mining and opt-in banner on the sign in page. We don't have any Javascript events on opt-in (although it's something we've considered) because we wouldn't be able to prevent it being abused and webmaster forcing visitors to opt in via a paywall type system which could in turn put us in an awkward position legally.
Some recent unrelated videos on the CryptoRich Youtube Chanel:
https://www.youtube.com/watch?v=Tb8Ie_RDB9Mhttps://www.youtube.com/watch?v=ancPpJU5VVY