Ya the kids are all on discord, only one thing discord does not allow pedophile discords and shuts them down as soon as they find out. Now they are even banning accounts that visit them. So the kids can't use that to get to like minded people. And yes I realize every time discord shuts one down another pops up, but it takes a lot of effort to find the new one, create a new account etc. There is a lot to be said about stability, and this website has it. Millennials and under wont like the dates look, but they don't like the effort of finding new things/creating accounts over and over even more.
And just a note, I am a millennial and don't mind the look at all.
Dark net has a similar problem with websites going down and it's non ease of use. Especially with the college age kids these days if it takes more than 30 seconds to learn they wont do it. Too hard for them. Also too much illegal information on those. Just too risky to even visit the supposedly legal domains on the dark web.
The main thing is we don't know because you can't actually register for Girl Chat and haven't for a long time. Even when some registrations were going through they were going through weeks after someone submitted so they might have given up by then.