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Xfinity (aka Comcast) routers broadcast a separate network for Comcast subscribers do use from their phone. I don't think it's unreasonable to think that Comcast and TV manufacturer's could have an agreement that would allow TVs to connect.

Using internet access doesn't seem to be illegal. If there's no password you can't even argue it was protected. Residential proxies are legal too (as they should be - fuck cloudflare).

They have permission from the provider, why they are able to log in.

Laws aren't enforced against large companies.