Once I was watching my dad solving puzzle. He got road sign that was hidden in 95% behind leaves of tree. We discussed for a minute should we select this or not

Once I was watching my dad solving puzzle. He got road sign that was hidden in 95% behind leaves of tree. We discussed for a minute should we select this or not. He selected. It was accepted. Puzzle solved. Then I thought it's ridiculous. Maybe someday someone writes a book „How to solve reCAPTCHA? Guide for beginners”.