I'm confused why you think SKY is predatory? If anything it's a pretty secure game. You don't have to interact with people if you don't want to, to get the chat feature you have to get each other candles. Yes you can sit on the benches but I'm pretty sure a lot of words are censored(?) and chat logs are moderated.

Also your girls are teenagers, Rather than keeping them away from every single online game why not teach them the signs and behaviours of a predator?

I'm someone that was literally raised by the internet, I was on habbo hotel at 13 amongst other websites (for example) with "predators" and I just laughed at them and found them pathetic and as a female this is something they'll have to experience their entire lives on the internet.