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So, I believe the main responsibility falls on the exchange. They need to make sure they thoroughly verify the information provided, cross-check the documents, and only approve KYC for accounts once they're sure everything checks out. Once an account is verified, it's no longer the exchange's responsibility. If there's an investigation, the exchange might cooperate with the authorities. So, if you're using P2P and funds from the other party come from illegal sources, you should be in the clear unless you're in colluding with them.
It must be because they manage the platform.
But to be investigated in detail by the exchange itself and the authorities to freeze funds in the account, there must be a large enough transaction.
If the transaction is under $100, it probably won't get any response and will be a less complicated internal resolution.
And it also depends on how many people report fraud on the same suspect.
Obviously, no one's going to bother hacking an account for just $100. Hackers usually go after big sums of money that they can launder through exchanges. The only real defense the exchange has is to freeze the account, but that's only effective if the authorities act swiftly to trace the money trail. Binance, in particular, is known for its speed – trades can happen in mere minutes, whether it's through P2P or the regular channels.