[Karunamon]

That's one good reason, another is probably pushback from merchants. Having these virtual cards completely shuts down the "free-trial-we-hope-you'll-forget-and-let-us-ding-you-for-a-month-or-two" business model that's so popular for online services.

[pbhjpbhj]

Not sure you need merchant pushback there - if it leads to unexpected charges then it's more likely to lead to inability to pay, or short payment, which gives the credit card companies their chance to feed off the client.

[kiriakasis]

Also usability, most people just don't care enough. (which is reasonable often)