Hi, how much have you gained from this site?
Were you able to upgrade & withdraw your earned bitcoins?
Edit: By the way, https://www.mywot.com/en/scorecard/bitminer.io has identified the website as untrustworthy due to scam suspicions & poor customer experiences by users.
If you are answering NO to questions above, you better not upgrade or stop using and promoting the website. Else your reputation & endeavors will just go to waste. Good luck with care!
RE: Totally free start with 20 euro in a recycling system.