If you have the power and the capacity to have coins to some degree, you have the capability to sell it as well. So the owners of that coin would have dumped it because they can, it doesn't mean directly it's a scam.
To be fair, scam accusations on an exchange should be when it breaks initial ToS, abuse KYC documents of their customers, prohibition on withdrawals without clear evidence and reasons.
Oh, so bitconnect wasn't a scam, onecoin wasn't a scam because people should do their own research first, and "developers" are allowed to do anything they want.
Interestingly, as long as it's written on the menu probably I could serve salmonella filled eggs and also take no blame if my cooks have HIV and they have a habit of cutting themselves over the dishes, after all, I have written in down as a disclaimer.
And ponzi schemes shouldn't be labeled as scams either, you must do your own research, if you invest in them you are to blame and you should go to jail, not the owner.
I'm surprised and amazed how here on bitcointalk people come and defend yobit who is promoting tokens without blockchains, guaranteed 1-5% income daily and many other scenes for which hundreds of websites have been labeled as scams and hundreds of users have been tagged.
Hmm, I must somehow ended on cryptotalk, I see no other explanations for this.