To my knowledge, the only app you have for non-Roku devices is The Roku Channel. That is NOT the same as using a Roku device. You can't install different apps/channels like you can on a Roku device.
The Roku Channel offers a wide variety of media at no charge, using ads to fund it. You can subscribe to paid services through Roku and access it through The Roku Channel, but those subscriptions are only available when using a Roku device (TV or player).
If you want everything that is available using a Roku player, the app available on third party TVs such as LG or Samsung does not provide it. You have to use an actual Roku player for all the content that is available on the Roku platform. There are certainly apps available for most of the major online providers directly on those smart TVs. But you don't get the simple, easy to use Roku user interface. And there are many, many services that are only available on the Roku platform. Only the user can determine if that's important to them.
Dan
Roku Community Streaming Expert
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