I'll just add to look specifically for those with blockchain analysis (https://en.wikipedia.org/wiki/Blockchain_analysis) experience, I don't see how it's gonna work if they're not well versed about it. Also pay attention on how deeply rooted are they with exchanges, kyc firms etc.. cause i think it gives you a hint on how much information they can easily access.
I'm not exactly sure but most likely gonna be settled legally.
Only if funds lands in a centralized platform e.g. binance, coinbase etc... Users don't actually control their funds in there so the recovery service can ask to freeze a certain someone's account if they have a valid suspicion.