When I put up an advert in Mudah, almost all scammers contacted me asking to use whatsapp chat. Saying they will make direct payment and asking for my bank details. In Carousell, also, there are scammers who say "contact using whatsapp. Number is "011******"". Checking Carousell on their profile and find they are no longer there - so confirmed as scammers.
Carousell also having the same problem? better direct contact their support team and report those scammer 
agree. less problem about scammers or anything. scammers will only go to platform that easy for them to cheat only lor
so far i use carousell is ok. seldom hear about their bad reviews also
Whenever I get chat(s) from who I think are scammers, I always report them to Carousell's support people, and get their replies. But in most of the cases, those scammers either deleted their account profile in Carousell or left them, after writing a message providing their phone numbers for whatsapp, so the Carousell support cannot do anything further, except, perhaps to just put them into a "scammer" database records... not sure whether they do this. Anyway, their support people always tell me to communicate in Carousell to ensure genuine buyers/sellers.