Looks like Google has been ignoring Blogger security issues lately. Bots are bypassing the human verification step and creating spam blogs automatically. This would be a serious threat to Googles security and Blogger reliability.
CAPTCHA a type of challenge-response test is a verification process where the subscriber has to type the numbers/text that are displayed on an image. This helps find out if the blog has been created by a human being or created automatically by a bot program. CAPTCHA has been used by almost all online registration steps after it was coined in 2000 by Luis von Ahn, Manuel Blum and Nicholas J. Hopper of Carnegie Mellon University and John Langford from IBM.
It is reported that Google has not yet allocated resources to work on Blogger. The Blogger team is still fixing bugs and gets away with work. This has lead to users opting for WordPress and other free blogging services present online.
This result in security ignorance could be due to Google having other top priorities which could yield more income to the company.