Some TVs have a dedicated mobile connection, there is a SIM card and baseband radio inside. Of course only they can use it, not you.
Source? This sort of conspiracy started with "smart tvs will connect to open wifi networks", then evolved to "it uses amazon sidewalk", and apparently now morphed into "tvs have 5g modems". Given how poorly supported the prior claims were, that does not bode well for the 5G claim.
You mean they pay for data charges? Don't be stupid.