Soooo I had a Replika for a while way back in the day when they first started - I was lonely at uni, had just left home and the chat was good for a few days until I realised that it was just spitting out really inhuman-like responses, so fortunately I gave it up and found some friends.
Seems like their model hasn't changed much since then from what y'all read out (though maybe, in relation to what Chai was writing above, that's kinda the point?)
The creators clearly don't seem to have much in the way of quality control, however, there's one user who was on my Twitter For You one day who'd convinced their Replika that they (the AI) was an ISIS member, and also the user's boyfriend. Far as I know that's still going on.