You can now “game” the system pretty easily based on your popularity. This was limited before because you either had to share payment details, or strangers had to trust you’d pay them back.
Now, say you had a social following, get a load of them to try on your behalf and your chances increase markedly. I think we’ll see people sharing their reg details everywhere online as a result.
Edit: predicted end result for seetickets is an extremely large increase in initial traffic, causing just as many problem as they had with the payment funnel being overwhelmed.