If by "through Roku" you mean through The Roku Channel (which is just another app on a Roku device) you are much better using a separate subscription (directly with MAX or Paramount+) than subscribing through Roku. With the separate subscription, you can watch the content you pay for on any device, including a web browser with most providers. If you subscribe through Roku, you can ONLY watch the content on a Roku device.
You won't be double-billed unless you subscribe to the same service through both places (direct and through Roku). Stick with the direct subscription with the provider.
Dan
Roku Community Streaming Expert
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