Having a security based blockchain where the marketplace runs on or simply a smart contract on an existing blockchain are two totally different approaches and different pro and con’s.
Technically speaking I think safex approach is way better, but people can only value what they understand.
The average might just see that one platform is used more already and he can use his Etherium and Bitcoin he has already without seeing the danger of purchasing with non privacy based cryptos…
You might remember safex had the same approach at the beginning and might be much further if they stayed with it, but they decided not to make it the quick and easy way, but making it good instead.
For the short term investor the decision might seem wrong (safex probably would be worth more right now) but I personally wouldn’t buy anything on that marketplace and revealing my balance and identity to people I don’t know I can trust…
That said you might be right, that them seemingly being the first mover and being accepted by lot’s of people might make it harder for safex if it will be usable later. And the fact that most people still use google and facebook shows that people speak about privacy, but most people don’t really care.