Android apps claiming to mine unminable cryptocurrencies have made their way into the Google Play store in an attempt to serve ads.
source https://www.google.com/url?rct=j&sa=t&url=https://www.scmagazine.com/home/security-news/android-apps-claim-to-mine-unminable-cryptocurrency-just-show-ads/&ct=ga&cd=CAIyGmM2Nzk3ODA2ZWViNjVjODI6Y29tOmVuOlVT&usg=AFQjCNE57ex0tpUY44D_qFo7M24ndoeieg