Changenow - you know that its a scam website right and their btctalk profile is full of negative trust
hodlhodl - its infested with many scammers
About ChangeNow, the accusation against them can also happen to Changelly or other instant exchanges, if you send them fund already, they can seize your fund and request for KYC, this is one of the reason people should not use any instant exchange, but if they want to use it, they should know their privacy can be leaked by instant exchange demanding for KYC before releasing your coin you exchange to.
The best among the exchanges are decentralized exchanges like https://localcryptos.com/, https://bisq.network/ and https://hodlhodl.com/, others have means of demanding for KYC.