Lack of moderation is an issue everywhere, because there are few consequences for the platforms.

Booking.com kept a clearly fraudulent listing (images clearly stolen from another Booking.com listing with mirroring + some filters) fully online for at least two days (I got distracted and stopped taking daily screenshots after that). I just got a response that they've taken it down almost 10 days after I had initially reported it (although I think they marked it as not bookable some time before that).