I haven't heard any scam accusations of ChainX.
Indeed there is no thread in the scam accusation, but there are many threads in Altcoin Discusion for example:
https://bitcointalk.org/index.php?topic=5227425.0But my problem with the exchange is that no IEO goes to ChainX and comes out successful. Check out all the IEOs listed on ChainX and search for which amongst them is successful today.
This is not a problem, because there really won't be a successful project from a scam exchange