GPT sites, more specifically get paid to complete offer sites, were one of the very first methods I tried to make free money online. I remember signing up to several of these sites hoping to make a lot of free cash online.
Here are my thoughts on this.
First, it was easy, legitimate, and required no investment. I really liked the concept of get paid to complete offer sites. The only downside is that doing these types of sites won't make you a lot of money.
I would say if you went the 100% free route and did your best to get referrals and participate in contests on these sites, your earnings could range from $20-$300+ a month. That is if you stay consistent.
If you want to earn money online without investment, gpt sites are a good way to start especially if you are just wanting to test the waters and actually make some extra free cash online. For more information, check out my Top 6 Legitimate GPT Sites