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It ships with the manufacturer botnet.
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I mean LG spies on me but I suppose it doesn't use my connection to ddos people, crawl for AI, or infect other devices on my network.

My question is basically how I can have reasonable certainty that the guys running the root site are not going to abuse it. Or is there also a way to do it offline?

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If you really have root access, you can check for yourself.
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I am unfamiliar with LG TV software but I would imagine that you can reinstall it after rooting and use custom software that you trust.
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Check what exactly? Run wireshark 24/7 and inspect every network packet for the malicious bits?
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