How about an e-giftcard that is just a series of numbers and I can use to purchase anything online without filling out my credit info.

e.g. I went to somewhere and bought an e-giftcard of $1000, I use $100 of it to buy a licensed software and download it, I pay another $50 for an online subscription,etc.

So I do not need disclose my location and even my name when I do not need to, this is basically a simple bitcoin-style-debit-card-for-online-purchases.

does such thing exist? any online stores accept that? if not why not.