The firm's internet safety boss, Marnie Wilking, said there had been "anywhere from a 500 to a 900% increase" in the past 18 months.
"The attackers are definitely using AI to launch attacks that mimic emails far better than anything that they've done to date," she said. After someone pays up, the scammers either vanish without a trace - leaving the buyer without a place to stay - or even try to scam them out of more money through follow-up messages.
"We've set up AI models to detect those and either block them from getting on there to begin or take it down before there's any booking," she said.
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