I didn't enable CAPTCHAs, for commenting on my blog! Why are my readers having to solve one, before commenting?It appears that Blogger has added a new CAPTCHA form, to the commenting process.
In Blogger Help: The word-verification option, we see the notation.
Note: Even if you don't have word verification turned on, anonymous commenters might be asked to enter some text. This helps protect your blog from abuse.It appears that "might be asked" is the key detail, here.
If you are logged in to Blogger / Google - or can login when commenting - you may not have to solve the CAPTCHA.
People who have not logged in can either log in, to comment using any allowed authentication option - or can solve the CAPTCHA, without logging in, to comment anonymously. A Blogger / Google account is not the same as a GMail account - and can be created, if necessary, as you login.
If you are not logged in, simply select "Google Account", and hit "Publish Your Comment", to login. There does seem to be some variation in ability to login, and retention of the message being composed, depending upon comment form placement, and moderation policy.
If you don't have a Blogger / Google account, click on "Create an account", on the Google "One account" screen. A simple 5 minute form, starting with any non Google email address, is all that is required, to create a Blogger account.
After you login, you can continue composing your comment. When you are done, select any available authentication option, and hit "Publish Your Comment", again. You should not see the CAPTCHA form, if you are logged in.
People who have filters blocking the third party Blogger / Google login cookie may still have to solve a CAPTCHA, and comment anonymously.
If you don't want to login, or don't want to setup a Blogger / Google account, you can solve the CAPTCHA. You can compose your comment before, or after, you solve the CAPTCHA.
After you solve the CAPTCHA, you can continue composing your comment. When you are done composing your comment, select "Anonymous" or "Name/URL", and hit "Publish Your Comment", again.
Many of the people, who report a problem here, may be people who also have problems previewing their posts, using Stats, and / or editing the template of the blog. All of these features are sensitive to cookie and script filters, and to various other security settings found on private computers.
I'll again point out that third party cookies are an increasingly critical issue because
- Google uses multiple domains, to host their many features and services.
- Many people filter cookies and scripts, without knowingly deciding to do so.
If you are seeing a CAPTCHA where one does not belong, and you are properly logged in to Blogger, check the cookie and script filters - starting with the browser "third party cookies" option, and as necessary, all filters everywhere else.