There can be. Some betting sites may ask that you only deposit using a particular payment method. As an example, although many betting sites allow you to deposit using eWallets such as PayPal, Neteller or Skrill, it may be that these options are not permitted in connection to claiming a free bet. Another restriction to bear in mind when looking to get free bets is geographical restrictions. Some betting sites apply geographical restrictions to their welcome offers depending on where you live.