Not sure if this helps anyone, as my reputation on the forums is pretty new, I been a lurker for well over a year now
But I've been using stocks.exchange only since mining intensecoin, and I've had absolutely no problems with it (knock on wood), I within the last couple of months was even able to mine directly to the exchange (altho i wouldn't recommend it as I think that can get messed up, some mining pools allow for it and require certain configuration)
I don't think it's a scam, at least I personally have seen no evidence of it being a scam. I probably should do more research on it, but it kind of resembles what I think would actually be a decentralized exchange (not sure if it is), if it's on a blockchain or not. I know I could easily Google and I will after I post this lol.....but just wanted to share my experience.
I'm now mining XSH there. The only minor issue I had was when ETH network was congested and it took awhile to get some ETH out, which wasn't stocks.exchange fault, it was the ETH network. For anyone who's had issues w taking out btc/eth, was it during the periods of major congestion? Cuz there were complains about basically every platform, project, etc and exchange during that time. It actually turned someone I know away from ETH completely cause he thought the ETH network was always that slow LOL.
Anyway, if I have any other experience in the future, I'll post, but so far I've been pretty impressed to be honest with stocks.exchange. A few times, I would look on it for shitty coins to buy really low that I know will pump soon, volume kinda sucks tho so I stopped doin that, but again, mining intense coin introduced me to it, and I thought it would be a nightmare exchange, but it hasn't been at all. Deposits and withdrawals have all been quick for me.
Bibox is one exchange I deposited on and it was a fucking nightmare - I am not sure if there server or website was just having issues at the time, but it took LONG, i'm talking several hours, just to cancel a fucking order. I couldn't believe it. I don't mean to talk shit about bibox if that was a one-off, but just sharing my experience. That's the type of shit I'm afraid of encountering on an exchange. Stocks.exchange isn't bad to me so far.