If you're worried about privacy just don't connect it to the Internet and buy a smart TV stick of your choice instead that you plug into the HDMI port of the TV (or use a Raspberry Pi if you don't trust those either). Problem solved.
Probably 99 % of people are fine with owning a smart TV, so it's clear that manufacturers won't cater to the 1 % that are not fine with it.
Probably 99 % of people are fine with owning a smart TV, so it's clear that manufacturers won't cater to the 1 % that are not fine with it.