There's no such thing as a free lunch. You pay for that software even if you're unused to putting a dollar-price on its cost.
Hard for me to get too worked up about tech giants seeing as using them is optional and alternatives abound. I don’t see how my life is made worse if someone else buys a MacBook.
None of the things that do irk me about tech companies (security breaches, unethical advertising, spread of fake news, and so on) would be addressed in any way by a breakup.
Try participating in modern society without an Android or Apple smartphone or tablet. It's still possible, but becoming more difficult each day.
(And to clarify, I don't mean "leave your phone at home today". I mean not owning a smartphone or tablet at all.)
Those are two examples. What about Standard Oil for instance? AT&T?
Sears too once had a "monopoly" on mail order products. People marveled at how amazing it was that you could order a product, mail in a check, and receive the product six weeks later, all without stepping into a store! Now they're bankrupt.
The whole concept of a business "controlling" the market is ridiculous. Amazon operates in a highly competitive, low margin industry that requires a tremendous amount of logistical overhead to function. The minute they stop innovating, they're toast.