I highly doubt that customers need not worry about exchanging large amounts, claiming no minimum transaction. According to the 11 BTC case ChangeNow is currently battling , it would appear that if you transact a large amount, ChangeNow’s automated system “supposedly” red flags such transactions, then asks for KYC, which goes against their anonymity policy. If you do not comply they seize your funds. It is a baffling case, as no one knows what exactly this system red flags, putting customers at risk with their funds. In other words, finding away to fraud people of their monies, with vague policies.
https://steemit.com/bitcoin/@johnycomelately/changenow-io-illegal-cryptocurrency-exchange-fraudulently-possesses-customer-s-deposit