A real problem is that you might not even need to give these internet access. If your neighbor gives their TV internet access and it can establish a mesh connection then it might be able to exfiltrate data that way. I don't know of any TVs that do this, but it's always been a possibility.

Another possibility is even if you don't give it access to your wifi, if you eventually give your TV away or sell it, the new user could connect it to wifi and if it has any persistent storage then it could upload all of its stored data about you at that point.

Companies that do this need to end their entire brand, because they're just helping the CCP.