An authority with the effective power to cripple the finances and business practices of Google for the purpose of reducing its market share to an arbitrarily lower percentage would be immediately detrimental to furthering the development of Google's products, and consequently detrimental to the utility of its users, while in the longer term it wouldn't be obvious that conceding the lesser competitors to scramble for this stolen market slice would yield better alternative products, nor that users would ultimately benefit from having more lesser competitors.