Earlier quoted context omitted.
How my devices configuration look (all their mac addresses banned on router level, they dont have access to internet): - tv, not connected to network, using raspberry pi 4 for kodi, connecting outside trough squid proxy limiting domains it can connect to. Was never connected to internet - roborock vacuum cleaner, rooted, software disabled, replaced by open source version - android deviced moved to microg lineage, arm…
The post you're replying to suggests that an independent LTE connection will be bundled into every device, so that none of the interventions you've listed will work. Good luck maintaining your bubble.
Anyway, why would companies bother to install LTE module, when 99.999% of people will just plug the device to the internet? It would be hugely inefficient. This just wont happen. I have seen chips beeing replaced by another ones due to be 50 cents expensier (and hugely more capable) and the LTE claim would go for even higher costs and logistics (signing the contract with mobile provider in small country like mine? Yeah right.) for trivial number of additional coverage? You are joking, right? My bubble stands as it is. It is your ass on the line, while I will renovate the appartment in next few years and adding tin foil within insulation layer into walls (to kill the wifi disturbancens from neibours) is already planned. 534 euros of additional cost is not that much compared to 60k that it will cost in total.
And dont forget about GDPR.