Do you think that looking at CPU usage would be sufficient for this kind of thing? I'm thinking a lot of poorly programmed sites, that simply use more resources than they should might get accused with that criteria. It might be a good place to start though.
Fair point. Perhaps any website that uses more than 15% of the CPU (constant usage), should be checked.
To have accurate results, we can simply look at the source codes of each > finding the keywords like "coinhive"/"webmine" and few others (as shown on the previous link that I posted)...