Here is a report about how websites take over your computer to mine for cryptocurrency:
https://deutsche-wirtschafts-nachrichten.de/2017/12/23/programm-zapft-heimlich-rechenleistung-ab-um-digitalwaehrung-zu-generieren/ [translation required]
Although this seems to be something new and sinister, is it really? Haven't the banking system and Wall Street been doing this for decades - taking over "our" financial system and manipulating it to generate wealth for themselves, without our permission or knowledge?
The entire US system is rotten to the core. Someone please put these bastards in jail.