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After luring customers with low prices, Amazon stuffs Fire TVs with ads
(arstechnica.com)
This is a most excellent place for technology news and articles.
roku because you 'need' an account to use (try here for one without a payment method requirement).
vizio must be a new thing for the current models. mine (bought last year, and was "last year's" model then) didn't need a net connection to set up for using as a 'monitor'.