Bibit is just a creditcard processor...
PBC is a standard way to buy gametime for mmos in many places, doesn't require a creditcard (can even be bought in some countries in stores).
The problem with all the services you mention is the very high fees they demand and/or security (especially with paypal, which isn't very reliable or trustworthy at all).
Amazon moreover is only available in a very few countries, none of them in Europe afaik. In fact, WG might not even be able to get an account to use the service.
PBC is a standard way to buy gametime for mmos in many places, doesn't require a creditcard (can even be bought in some countries in stores).
The problem with all the services you mention is the very high fees they demand and/or security (especially with paypal, which isn't very reliable or trustworthy at all).
Amazon moreover is only available in a very few countries, none of them in Europe afaik. In fact, WG might not even be able to get an account to use the service.