I'm not sure about the credibility of this site because I never heard of it. However, by simply typing gourl scam on google, you'll see lots of posts stating that this site is scam
Registrant Organization: Delta Consultants LtdRegistrant State/Province:
Registrant Country: DM
http://whois.domaintools.com/gourl.ioDelta Consultants Ltd - probably should be something that they simply created to give some false credibility to their scam site
OP search for sites that are reliable and always do researches