Always check
1. http://www.badbitcoin.org/thebadlist/#E
2. http://дoвepиeвceти.pф/site/bitcoinmining.me
3. http://www.scamadviser.com/check-website/bitcoinmining.me
4. https://bitmakler.com/cloudmining
5. http://www.cmmonitor.com/

Where at least one "bad" - don,t trust.