I dont know why you are suggesting websites that can highly lead people to get scammed.
Changenow - you know that its a scam website right and their btctalk profile is full of negative trust
hodlhodl - its infested with many scammers
https://hodlhodl.com/ is a decentralized exchange, even scammers can try to make use of a centralized exchanges, they can be more common on decentralized exchanges, it is you that should be careful with them, anywhere that money is involved, scammers are present there. Just for you to follow ways you will not be scammed, like not relying on credit alerts from bank but checking your account to make sure your funds as been credited before releasing bitcoin from escrow.
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.