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So there's no option for him to get his funds back if he doesn't want to go through the KYC procedure? It would be nice if a refund option was available, especially if OP was not made aware of the KYC requirement (and I don't know if that's actually the case).
I had an issue with Changelly in the past and started a scam accusation thread against them when it appeared they weren't taking any action based on my communication with them. Eventually they did make things right (though not 100%), and I don't think they're out to scam anyone.
If you search this exchange before, you'll see a bunch of thread have discussed against this scam exchange. Changelly have multiple scam accusations and only solve a few cases.
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Didn't go through that list, but I would be willing to wager that at least some of those cases were resolved and that there was no follow-through post(s) made by the OPs of the threads. That's an assumption of course, but I've seen it happen before with some Yobit scam accusations.