"Overnight stay available, XX minutes riding": Second-hand platforms become breeding grounds for sexual exploitation, who will protect the online realm?"Overnight stay available, XX minutes riding" - this jarring phrase, appearing in the product description of an online second-hand trading platform, is like a pebble thrown into a calm lake, instantly creating ripples. Why has this platform, which was meant to be a place for exchanging used items and promoting circular economy, become a breeding ground for sexual exploitation? What societal issues and human failings lie behind this incident?From "flea market" to "grey area": the challenge of regulating online platformsIn the internet age, second-hand trading platforms have emerged, offering a convenient channel for the distribution of goods...