I wouldn't mind doing it. I run my own DNS so it wouldn't affect me, but I figure if they're already trying 8.8.8.8 they may as well try 8.8.4.4 and perhaps more, so it'd require a bunch of firewall rules.
Now, all of that is moot point cause I hate the whole "smart TV" thing, so they'd never be connected to the internet.
They can (unintentionally) obfuscate what they're doing.
I've seen the agent make scripts with commands that aren't immediately obvious. You could unknowingly say yes when it asks for confirmation, and only find out later when looking at the output.