I’m not sure if you’re trying to intentionally ignore the issue here.
You are asking people to trust Google. If people trusted Google, they’d use Google Chrome in the first place. Your entire userbase is people that don’t trust Google, at all.
If you use Google proprietary software in Firefox, and tell people to just trust Google, you just entirely destroyed every value Firefox ever had, and your own job.
The whole purpose of Firefox is that I don’t have to trust Google. That I don’t even have any kind of interaction with Google. That I can exist without having to use Google’s technology.
If you use Google Analytics in Firefox’ Addon menu, or in Firefox Focus, and say "but Google doesn’t technically track people because we have a contract with them", then I can just as well use Chrome. If I trusted Google to keep their word, I’d use Chrome.
Chrome runs far faster, looks better, is easier usable, has better addon support, works with more websites because everyone only supports Chrome anymore, it actually supports 10 bit video, oh, and it even does hardware video decoding on Linux.
The entire reason anyone still uses Firefox is because they don’t trust Google. If you ask people to trust Google, you’re literally telling them to just use Google Chrome.
That is the elephant in the room that everyone at mozilla tries to ignore by putting Google Analytics into the addon menu of Firefox (and, as result, also in the Tor browser), and by importing a Google Analytics library into Firefox Focus. This destroys the one single value that Firefox has in the current world: It’s not Google.