On: Hacking and defeating Google's reCAPTCHA with a 99% accuracy

[kedyr2]

captchas are very annoying. it is surprising that they have lasted this long. what would be the best alternatives?

[TillE → kedyr2]

Obscurity. If you're not a significant target, you can get by with simpler methods.

Deciphering obfuscated text is one of very few verifiable tasks that humans can do which computers cannot.

Alternatively, you can look at other methods of identity verification. If you ask for $5 to create an account, you'll have few spam problems.