@caryanderson log into your Roku user account (https://my.roku.com) and look for any subscriptions. If you don't find anything there, then Roku is not billing you. Thieves can submit charges on a credit card and claim to be anyone. They are probably hoping you don't bother contesting such a small charge, but if they submit thousands of these false charges they can steal a lot of money.
Again, if there's no official Roku subscription listed, you aren't being billed by Roku. I would contest the charge with your CC company, and request they replace your card with a new one that has a different number.
Dan
Roku Community Streaming Expert
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