Ineffective at preventing bots and also ineffective at letting humans through reliably: Good luck to those with accessibility needs (elderly, blind, etc) in ca

Ineffective at preventing bots and also ineffective at letting humans through reliably: Good luck to those with accessibility needs (elderly, blind, etc) in catching those moving glyphs... No more vegetarians visiting your site (after all if they don't put pepperoni on their pizzas they must be robots...) The bot-writers meanwhile can write code for each puzzle (the puzzles, requiring art assets, are expensive enough to generate that the many spammers can out-muscle the few areyouhuman puzzle-setters)