About twenty years ago, I was taking a flight back from Rio de Janeiro, Brazil to the US. In the middle of the night the pilot got on the loudspeaker and said "hi! Having some engine trouble, so we are landing in Manaus." Manaus is in the middle of the Amazon. Needless to say, a bit scary to hear that, but we landed without issue. They told us we had two choices: the nice hotel with a shared room, or the lesser nice…
I fully share your concerns. And I don't understand how apparently tons of Teams and email conversations can be archived and sold without any kind of scrutiny. How can such data be sold without the consent of all involved parties? What gives Google the right to use it to train LLMs? Is that just a way of washing away the legal protections?
When you join a company, you typically sign an agreement that talks about how the company owns all your output. Thumbs upping a Teams message is work output and they own it.
Every email sent and received. Every keystroke. Etc etc etc.
If you don’t want your employer to log and sell it, start your own company. Or use a personal device. I do the latter.