My advice would be NOT to connect any kind of TV to the Internet. They have microphones and sometimes cameras, and are a huge privacy risk.
A measured compromise would entail the meticulous profiling of the TV’s network traffic, followed by the imposition of complete blocking at the DNS level (via Pi-hole, NextDNS and alike) first, whilst blacklisting the outgoing CIDR's on the router itself at the same time.
This course of action shall not eliminate the privacy invasion risk in its entirety – for a mere firmware update may well redirect the TV traffic to novel hosts – yet it shall transform a reckless exposure into a calculated and therefore manageable risk.
As for the extracting of data, yes that happens on a massive scale. In free products that no one is forced to use. And I would argue that, by now, almost everyone should know that comes at a price, it's just not monetary to the user. At that point it's a choice people make and should be allowed to make.
If something is free, you're the product. But if it isn't free, you're paying to be the product.