> They are all desperately trying to eat each other's market-share more or less

Less.

Apple, Amazon, Microsoft (should be part of FAANG), Google are not trying to eat Facebook's extraordinarily profitable social monopoly. Google tried, kinda sorta, briefly. Apple raised a pinky for a second, with Ping. They can't and they know they can't, they've all given up on trying. Facebook gets to print $20+ billion per year in monopoly profit from here on out unopposed. Separately, the epic position of Instagram, WhatsApp, and Messenger is almost entirely unopposed by Amazon, Apple, Microsoft, Google.

Apple, Amazon, Facebook, are not trying to eat the Windows-Office monopoly. Google is, kinda sorta. They're certainly not going out of their way to do it, say, by cutting into their $100+ billion in cash to massively subsidize the effort. Most of Google's focus is on mobile. Apple is by far the most successful company on the planet, they're not desperately trying to go after mass market share with the Mac to challenge Windows for the bottom 90% of the market. Apple is fat & happy with where their margins are at in computing, they gave up trying to dethrone the Windows monopoly a very long time ago.

Amazon, Apple, Facebook are not trying to eat Google's long duration, extraordinarily profitable search monopoly. Google search is tracking toward $40 billion per year in operating profit, the second greatest product for printing cash on earth next to the iPhone. Amazon throw a shot at it, briefly, and quickly gave up. Apple and Facebook, to whatever extent they ever considered going after mainstream search, haven't done anything there. Only Microsoft took a serious long-term shot at Google search; they're not making a serious effort there any longer, they're maintaining. Microsoft hasn't been desperately trying to take away Google's search monopoly in many years. Not only did they realize they can't, no matter what they spend, they probably like having the monopoly issue to hit Google over. The other companies are also not trying to build their own competitor to Android or YouTube (Facebook has taken a modest shot at YouTube, it isn't scratching them so far), almost entirely leaving both positions unchallenged (Apple has no interest in actually competing with Android in what it does in the market, Android is a required part of what makes the iPhone possible and lucrative, as previously with Windows & Mac; Android phones being the majority are the best thing that ever happened to the iPhone).

Google, Microsoft, Facebook, Apple, aren't interested in entering retail to compete with Amazon, essentially at all. They have no interest in those margins. They bat at Amazon's online retail empire at the edges. They're also not desperately trying to distrupt Amazon's publishing empire, ebook monopoly (arguably the least concerning of all the monopoly positions in the group, because digital book sales are declining and independent book stores are thriving).

Netflix is part of FAANG, and they're the least powerful of all of the major tech companies. They have no monopoly. Their margin is so bad it's realistically very negative - they're vaporizing incredible sums of cash, borrowing heavily (perhaps dangerously), to try to get to scale before the clock runs out. Their balance sheet gets more dire by the quarter.