Captchas, or some anti-bot software is still needed whenever we deal with credit cards, because we are still using the obsolete version where, if you get your h

Captchas, or some anti-bot software is still needed whenever we deal with credit cards, because we are still using the obsolete version where, if you get your hands on the numbers , you can charge any amount you want to whomever you want, instead of a model where your card digitally signs the payment request for the given amount and receiver, which would mean that any theft is pointless. Anti-bot measures are also used to try to prevent password guessing on e.g the login site to gmail. Finally, sometimes some places offer things like tickets that go very quickly, in which case having a bot reload the page means the tickets are likely to go to somebody owning a bot rather than a fan of the performer. None of these cases are solved by payments, they are solved by client side certificates and, in the last case, by requiring the name of the people who are to use the ticket.