I don't know they scam or not, but six months ago I had experience with one of the faucet site (LTC) which pay using Coinpot service, on their website Coinpot said weekly payments would be made if we reached the minimum threshold, but until now the balances still with them and never sent it to me (I reached minimum threshold), contact by mail or social media has no reply. Now I Make it simple stop using them  .