I don't find GPT sites to be reliable at all. Most of them turn out to be just a waste of your time. This is because they pay really low and their tasks keep reducing with time. At first, you may have so many tasks to do and you can even earn $1 a day, but as you continue staying in the site, reaching payout becomes so hard.
I once worked in a paid to click sites. You spend so much time clicking ads, but you end up earning just peanuts. You also use so much data bundles being in the site, which does not even get compensated by what you earn.
Personally, I prefer to stick with get paid to post forums. They may not pay much but they are much better than other gpt sites. As long as you do the right thing and do it daily. Think for example here in Trendri. Posting long quality content earns you well and you can come back here daily.