Doing P2P on binance or LBC is safer compared to the completely decentralized exchange when it comes to the source of funds but there is no 100% security anywhere, even if the person completed KYC still the source can be from someone else's account and it could be from not knowing their knowledge and it can continue for months and years with no problem but when banks found then your account and fiat stored in there are at complete risk of getting frozen almost forever.