Like any get-rich-quick scheme, bitcoin scams thrive on the gullibility of its victims. Just because it's a digital currency doesn't mean you can acquire wealth quickly.
Always check the site you are always using and if possible avoid google when searching for the site because there are times when the ones that appeared are those scam sites with just one letter in the address different from the original one and its interface is just the same so if you carelessly input the password then you will be hack and all the coins that you hardly earned will be gone. After using a legit site, bookmark it and access it from there. Do not participate in HYIP as most probably it will be just a scam and you will lose your funds.