https://www.question2answer.org/qa/61441/why-qa-themes-website-are-using-coinhive
This is a digital currency mining javascript. innocent people can leave their tab on and get their to CPU 100%. be careful.
qathemeswebsiteusingcoinhive
https://www.wappalyzer.com/technologies/security/coinhive-captcha/
Download a list of websites using CoinHive Captcha} with email addresses, phone numbers and LinkedIn profiles.
websitesusingcoinhivecaptchawappalyzer