I agree that it is important to know who is behind them. Unfortunately there isn't a lot of information to that regard on the site. I'm not so sure that it matters so much with an exchange that doesn't hold your coins/tokens. If they do a runner they won't have your tokens/coins to run off with. I have no idea if it is possible to steal your credentials from Scatter but I would have thought at every point that you would need to sign something. As long as you are careful about what you sign in Scatter I would imagine it would be fine.