Windows 8.1 with Bing is sold at a very low price with a 100% rebate (I.e it is free). Google shares ad revenue from bundled searches, if you use Google on Fir

Windows 8.1 with Bing is sold at a very low price with a 100% rebate (I.e it is free). Google shares ad revenue from bundled searches, if you use Google on Firefox then Mozilla takes 20%. Likewise for Windows OEMs and Apple Safai.