Is selecting square images before posting on Yahoo Answers made intentionally to annoy people?

Because there are too many posts? Too many trolls? DDoS?

Sometimes the image is not even clear. It's clearly annoying.
Update: The reason why I'm wondering is that bots could be blocked in an easier way... It could be, for example, matching a word to its corresponding image - much less confusing. Some particular fire hydrant might lay on just a tiny part of the square and I start to panic. Sometimes I feel like my IQ is being tested.
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