Every company should attempt to be the best in their field, yes. However, that does not in general encompass taking vast piles of VC money to run a loss-leader service for years and years on end in an attempt to monopolize an entire sector by undercutting all the competition that has to actually make a profit pretty much every quarter, with their valuation almost entirely based on the idea that they can succeed and then raise prices to become profitable.

Yes, there is a qualitative difference here.