After the Israeli attack using pagers I think this is no longer paranoid at all.

The same goes for Chinese built cloud connected hardware, especially if it is grid connected, contains heater elements or batteries. Inverters, solar panels, vehicles, 3D printers, the list is endless and all of these are either potential fire starters or ways to destabilize the grid. Used maliciously the potential for misery is pretty large. All this crap that wants to connect to the cloud from a country where your average citizen has very limited access to the internet should give you pause: if the Chinese government thinks these connections are A-ok then they must see some advantage, especially if all the services are supposedly free of charge.