I keep my Dubia in a large rubbermaid container and they can't climb up the side at all. They are actually fairly slow and clumsy. In addition, they do not breed at typical indoor (house) temperatures. Mine do not breed at all at 72F, although they live and molt just fine at that temp. In my experience, bumping the temperature into the 80's is necessary to get them breeding. Absolutely minimal infestation potential IMHO. Obviously, my experience/opinions apply specifically to Dubia.

The frogs and toads digest Dubia just fine. In addition, I would also point out that they can subsist on [at least some] cricket gut-loading mixes supplemented with some fresh fruit or vegetables. I use the Repashy gut-load for my Dubia (and as an aside, isopods like it too)..