People were using Fitbit, not Google, and now their data is in Google's hands without their consent. Even if they stop using their devices immediately, Google still has the data Fitbit collected previously.

It's a good lesson about being willing to share data: even if you trust the company you're sharing with, a company you don't trust may end up buying that company and getting your data after all.

If you're privacy-minded, the only safe option is to treat all companies as untrustworthy.

While that sounds like a logical argument it’s becoming more and more difficult and will be impossible soon. It’s like saying you can live without electricity. Sure you can and there are people who do but that’s not the point. The point is a single company owning so much information about so many people without proper oversight. In such world it doesn’t matter if YOU are not a google user. You’ll suffer the consequences regardless. Start with how such a society is going to vote in elections and move from there.

If your friends & family own or use Google's products, that's already a lot of overlap onto your life.

Unless they manage to monopolize communication products. Snail mail has been doing well for me, I guess.

If you text people with Android phones, Google can read your text messages even if you don't use their products.