Peacock is a freemium streaming service. Most of their sports are free since they get ad revenue from the event anyway. I remember this discussion when MNF went to ESPN.
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For sports fans on a budget, you'll be happy to know that NBC Sports is available on the free tier of Peacock. You won't need to pay anything to catch the latest events in sports. And as an added benefit, free account Peacock users even get access to select content from the WWE Network.