The extension is configured to only be loaded on pages served on the local machine (localhost, 127.0.0.1, or file://). So technically, no, you can't use our extensions in a deployed site.
With that said, I think it's fairly easy for a technical user to trick a badly written monetized site. The Web Monetization Docs say that the developer has an optional step to verify the payment. But IMO, this shouldn't be marked as optional.
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