I haven't seen this, but they have anti-bot systems in place that triggers when players play along time without breaks. Not that it prevents all cheaters, but the most obvious ones are cought.
Besides the client software also scans for certain software drivers that are used by bot software, but professional bot cheaters will put up multiple computers, one for the bot and another for the party software.
Never heard of validation pop-ups, but it sound like an interesting development.
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