After all, if you don't want others to share the data, you shouldn't interact with them.
There are huge differences here on at least three crucial dimensions: intent of the sharer, the audience with whom it is shared, and the sensitivity of the data shared.
Sucks to be you if your relationships, be they business or personal, are as fragile as a volatile technology.
Expecting your friends not to use cloud services seems a bit unreasonable and unenforceable. Are you really going to tell all your friends they should write down or memorize your phone number instead of storing it in their phone?
What we talk about isn't.
At some point privacy is no longer a choice, not a real choice anyway. You get to chose between participating in society or keeping your privacy. It shouldn't have to be this way, but it is.
Microsoft collects your friends' names so it can spell their names correctly when you use speech-to-text or related features. I thought that's what you were objecting to. What kind of data are you talking about?
Personally, I require that all my so-called friends communicate with me in morse code over short wave radio. It works a treat.
The ramifications of the destruction of anonymity and privacy affect everyone whether or not we understand enough right now to get this.
Also, "sucks to be all these people who would benefit from interacting with me but where I may stop interacting".
This is not a problem that is a personal, individual problem. This is a social problem. Period.