There may be no global, credible alternatives now. There would most certainly be local, semi-credible alternatives gaining ground shortly after such a move. If

There may be no global, credible alternatives now. There would most certainly be local, semi-credible alternatives gaining ground shortly after such a move. If the biggest, most entrenched provider suddenly disappears... well that’s going to give some ideas to a lot of people. There are other search engines (maybe not as powerful as Google, but if you don’t have a choice...). There are other e-commerce platforms, and there are a shitload of cloud providers. There are other high-end phone and laptop manufacturers. There may not be a credible FB alternative (but I’m not shedding any tears over that). The only real crazy-hard-to-replace infrastructure IMO is the App Store duopoly. As another poster pointed out, there are countries (Russia, China) where credible alternative providers evolved because FAANG were not allowed to enter the market. In time, the same would happen if they were to leave a market.