Privacy coins could facing law problem in the future, and if its happen i think it could impact bad on the price. Also, afaik many exchanges prefer not to list privacy type of coin.
Yes, they’ll face problem later on so it’s too risky to invest on this kind of project though there are top coins that still doing good despite of that kind of platform, so it will depend on the team on how they work on their project. I’m not investing on the early stage, I still want to see progress before doing so. If you see potential on Ghost, then go for it that’s your decision and you should stand for it.