The issue is as with any other monopoly. Initially, something seems nice and convenient, like Netflix and Amazon. But then you realize that you've sold your soul to a giant multinational that will then push pedophilia and censor dissidents at will. By then, it is too late, because you withdrawing your patronage is not going to stop either, and all competitors are already out of business, with no chances of any resurrection.

Generally, your 'leave well enough alone' seems like a good strategy. The problem with the opposite has been proven from the French Revolution to the Khmer Rouge, but we're nothing if not stubborn learners.