There are many online wallets like Xapo and Coinbase that do not charge any transaction fees or they pay that fees by themselves. I want to know that how would they profit from paying for their user's transaction fees ?
If no fees is charged then the transaction take a much long time or even might get cancelled !
I think they survive cause the gain profit in buying and selling bitcoins. and The ads and capatchas in their site make them survive through out the bitcoin wallet list