Ask HN: Best 65“ smart TV that doesn't spy on you / doesn't show ads?

You're asking for a 'smart' product that respects your privacy, which generally isn't something that exists for the consumer market. Your easiest option is refusing to give your TV an Internet connection and doing things your own way instead (input from a computer or other small device you can actually control easily). If that's not an option then you can mess around with firewalls or VLANs and so on for it, but it's still quite a bit of effort.

I hear Sceptre is a Non-Smart TV brand from Walmart.

https://www.walmart.com/ip/Sceptre-65-Class-4K-2160P-LED-TV-...

I don't know if such a thing exists.

But I remember Vizio got hit with a huge fine for spying on viewing habits and had to make everything opt-in in response. So they might ironically be your best bet, despite a terrible history before this.

Probably a monitor of the same size.

Unfortunately they also tend to be significantly more expensive than TV sets.