I'll say it again...a smart meter can very quickly become non smart....

Id seriously not get to hung up about it. This sort of stuff is installed and maintained be numskulls... absolute doddle to make sure it never talks to "the cloud" the minute they leave ...
I know of several locations that the smart meter "wont talk to the system so we still have to read it manually...oh that's odd what a shame"
Personally I've left ours smart as I'd rather pay for what we use than get screwed over all the time with estimates. Anything sinister ever did loom on the horizon ..our network would suddenly "deteriorate."..