If the amount involved is substantial, it is advisable to hire a lawyer. A lawyer who has experience with similar cases will be preferable, as he will know what steps to take in order to get a court order freezing funds. With such a court order, the exchange can be ordered to freeze the account and hold the funds until a decision has been reached on whether they should be returned to you or not.
That is if OP is lucky enough that the hacker will keep those coins in the centralized exchange long enough for the paperwork to be completed for the freezing to take place. If I was a thief, I would probably try to get away as fast as possible and not use those centralized exchanges for those purposes at all.
If the scammers had to go through KYC at Gate.io and Huobi, a good lawyer could eventually get the exchange to reveal the names of the account holders. By then, the coins will probably be long gone. But OPs lawyer could then go against those individuals, assuming they didn't use stolen identities and KYC information of some poor bastards that have nothing to do with this.
Yes. That is right. The OP can't really do much about a scammer on his own. That is why I recommended that the OP hire someone from the legal profession, so that he could request a freeze of funds and/or contact information of the scammer if he discovered that the stolen coins ended up on a centralized exchange. If the scammer sold them on an exchange that is regulated by FinCEN (or some other similar agencies in other countries in the world), then the OP would have a pretty good chance of getting at least some info from the exchange, which will ultimately enable him to take further legal action.
