Anonymous
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MANY have asked about this here already. The captcha is a security measure that began on 5/27/19, to prove you are a human user and not a bot program attempting to use the site. Apparently Verizon Media chose to hire the services of Google to provide that function (as noted by the text at the bottom right of the pages “This site is protected by reCAPTCHA and the GooglePrivacy Policy and Terms of Service apply.”), instead of programming it themselves. Hopefully the captcha's will be required less frequently, soon. Otherwise, I see another migration of users away from the site due to the added annoyance. If you select the headphones icon to listen to an audio captcha, and type in a single significant word you hear, you’ll get through it quicker than selecting images.
Any time you have an issue with the site or something changes, scroll through the Yahoo Products>Yahoo Answers subcategory and see if anyone else has posted about it. You can find your answer and save yourself 5 pts a lot of times. That’s what the site was designed for (so users wouldn’t need to re-post questions that had already been asked and answered multiple times)
Anonymous
A lot of liberals have been posting hatred and bigotry. The captcha is an attempt to eliminate that.
Daniel
To Prove that you are a Human being and Not a Bot something new that Yahoo is Testing out Yahoo is trying to Control Spam and Bots and such Its not just you that's seeing them a lot of Other Users are starting to see it come up
Peter Boiter Woods
They are testing new spam fighting measures. It takes just a few extra seconds for each question or answer. They have to do something to prevent bots who can take down the sight for days or weeks at a time. Quora is the alternative if you don;'t like it.
If you only did it at login, the spammers could quickly get around that. It must be more often to really work.