Yes it is untill you are investing in right Projects. There are many projects in the market with great potential in future. But you have to identify them. And hold them untill they rise to the top.
Ao it depends on your investment skills whether it safe or not. If you have a great sense of investment then its completely safe
Every potentially good project can be a scam, but if you think this is a scam project - it can be useful and not at all a scam.