I don't think there's anything in the TOS about it and there is a way to identify a unique device. I don't agree with what they're doing, but you'll probably have to take it up with them. When these devices first came out it was commonplace to tie a purchase or subscription to a particular device, but that was when when most people only had one Roku. Now I think it's ridiculous to do that.
How did you subscribe to it? Was it with them directly or through Roku? Roku subscriptions are tied to an account, not a device.
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