True. But is it your operating system? You did accept the End User Licence when you installed, did you not? Oh, it has not yet come to that.It's my machine and I'll do what I like!
With all the fuss about privacy and the shopping lens, I would not be surprised to one day see some kind of notice to the effect that by using Ubuntu I have accepted certain conditions of use.
A small part of such a licence is already in place.By searching in the dash you consent to:
the collection and use of your search terms and IP address in this way; and the storage of your search terms and IP address by Canonical and such selected third parties (if applicable).