Haven't you always wanted to be a movie star?lol.There are many ways to make a purchase.Many have done it and find it easy once you actually do it.If you go the selfie route it's only to prove you own what card you are using.Once it's verified your done and don't have to do it again.They need to cover their behind also.Buying bitcoin is totally legal.They don't want thieves purchasing bitcoin with a stolen card.
Going "the selfie route" - that is, showing yourself with a credit card in a video - does not PROVE you own it! In any case this sort of response does not help people who are having difficulty with this method of payment. It neither offers a solution nor advances the position.