Humans as a nature are never satisfied. Though the no deposit casinos provide them with bonuses, they want more. They know that these bonuses will run out soon and then they will soon have to part with their money. In trying to fool the no deposit casinos they register themselves using different email ids.
These people are taking a great risk. They might find their IP banned from these no deposit casinos. Most of these sites are run by professional gambling organizations like casinos. They have got the requisite software to check if a same person is logging in using 2 different profiles. They just ban these persons from playing in their no deposit casinos, not only the ones that give the offers but the member will be banned from all other casinos that are ran by the same company or marketed by the same company. It is possible if you abuse one casino by not following the rules you might be banned from a whole list of casino sites. Really isn’t worth the risk for a little amount they are giving. If you want more gambling money to play with then just deposit and they will give you more money than you originally purchased, this is a better solution. If another person in your household wants to play they will need to pick out a different casino that neither of you have ever joined.