They know what you do 'offline' (with proprietary software it's standard practice)
Summary: They've had the audacity to call it "telemetry" and pretend that surveillance companies (spying giants) cannot figure out who you are based on IP addresses
If Linux becomes a lot more reliable in the future, it'll be an "hey hi" miracle. If Linux becomes a lot less reliable in the future, we'll know why and who is responsible for it.