Meanwhile it will soon no longer be possible to use AMEX Serve cards as a method to collect payments when selling bitcoins online because they are taking away the anonymous funding options (MoneyPak, Vanilla). You can still reload with cash but you need to go physically to a register at some store.
I'm pretty sure they did that to discourage Bitcoin trading using Serve. Talk about a mixed message.
Moneypaks and Vanillas with the scratch off codes on the back are both being discontinued. This is being done to discourage money laundering and other scams that were being run with moneypaks. It has nothing to do with AmEX.