Cryptopia isnt a scam. What they are though, is way understaffed, and way underinterested in moving fast when something is wrong with their systems.
All of the exchanges get called scammers by impatient people. Meanwhile the people complaining keep using the exchanges, thereby allowing them to keep doing their business as theyre used to.

Now as for bulwark transfering speed, that seems to be slow by design or something. I can move XVG or LTC or whatever else into crypto-bridge for instance, very very fast. BWK however, takes an hour to a couple hours even there.
End for me, im not mining this coin at all anymore, there is much more profitable coins to mine. People that think bulwark is most profitable now: do not use online calcs, or learn to use them properly. Do actual tests to see what your most profitable coin is and i can tell you already its not going to be the one the online calcs tell you is most profitable.