Hi, while I was checking my wallet balance (PS :  I use freebitcoin to store my BTC ) I have found that each amount I send to my wallet is being transferred instantly to that address : 1Fu3iBR2EMQWeYGi3XvrPmcPUkne8ZWj9h and I assume it belongs to freebitcoin mods .
My question is , which type of wallet do they use ??