The offers for free coins are mostly a scam. You will spend hours filling out surveys just to be told you don't qualify. This should be sorted within the first 2-3 questions, not once the survey is completed. The truth is you do qualify, they just don't want to pay the coins, this is called a scam. Imagine working being told you will be paid, then not getting paid, this is illegal in most countries. Google needs to stop this.