The Overwatch League will receive at least $90M over two years from Twitch in exchange for streaming rights, sources said. <a href="http://www.sportsbusinessdaily.com/Daily/Issues/2018/01/09/Media/Overwatch-Twitch.aspx" target="_self">The deal, announced earlier today</a> , is believed to be the biggest exclusive distribution deal in esports history. Twitch will show every regular-season and postseason contest f…