And I'm sure that Spotify works usually, and I'm sure it's against the Spotify ToS, but I'm also sure that this level of reliance on end-to-end Internet connectivity is bound for inescapable failure.
Eventually.
(For our "little" pop-up off-grid DJ rig, which was not actually particularly small: I made sure we had redundancy for everything we felt we needed: Power, amps, sources, speakers, and the rest of the works -- except Internet. We assumed, going in, that the Internet would be useless and thus none of our actual-plans relied on it, and we also knew that we were pretty far from any civilization that could garner us replacement parts.)
What's really jaw-dropping for me is the deezer-based live stem extraction, where you can press a button and just be playing the vocals or the drums. (This is, weirdly, fundamentally the same tech that makes those pictures, which still astounds me.) I still get annoyed with the "sync" button because it doesn't let me do a half-beat lead-in. I will probably always be a dinosaur in this field, which is fine. But I would at least try to pass on the hard-earned knowledge that you have to assume in a live performance any given system will fail at some point.