With the continuing collapse in online advertising revenues, websites are turning to other methods to pay their hosting bills – including using visitors’ computers and phones to mine cryptocurrency.It’s a controversial practice, with some likening it to running malware on visitor’s computers, but it is a potentially lucrative endeavour for websites. The downside is that at best it slows down visitors’ machines, and at worst it can also drain their batteries or send their electricity bills soaring.BitTorrent search engine The Pirate Bay, and US video streaming service Showtime, are two sites that were discovered to be sending mining code to users. The former owned up, posting in mid-September that the code was “just a test” and that the experiment was being done with a view to removing all adverts from the site.

Source: Ads don’t work so websites are using your electricity to pay the bills | Technology | The Guardian