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Yeah, but they’re not. That’s the modern world. But also even if it was a web server there’s usually ways to advertise the IP for the app to connect to. I’ve seen other stuff do that. So getting an IP is easy. Once the app knows the IP and if you really want to allow connections from outside to your IOT devices (I wouldn’t) it could remember the IP and allow that.
You really don’t need to give a fixed IP to everything. I think I’ve given 1 or 2 things fixed IPv6 IPs. Everything else is fine with what it assigns itself.
I think it’s more twitter slang. Sure it can be applied elsewhere. But I’ve mostly heard it used regarding twitter posts.