Why would two companies burning 100s of billions of dollars and are not profitable be safe keepers of your data when there is a huge market for all of that in the us and the us has really weak protections for those things so the companies can sell it to defense agencies?

Thing is, either way your data is getting hoovered up. If not today then eventually. It's just a matter of where. If you work in an industry where nation states might want to do you irreparable harm then yea don't let your data leave the country.