While I wouldn't tell anyone my life story immediately, they may get to know more about me through consistent interaction over time. I'd prefer if apps got our data similarly instead of in bulk from shady data collectors.
But this reminds me of gossip; it would be nice if only our non-sensitive data were strictly shared with our consent, both across apps/companies and across people, but I could see that killing the market value of data collection. Plus maybe sharing user data has similar 1st amendment protections as gossip? But much like talking about others, some such discussions are more ethical than others.
It would be nice if an ethical standard for user data collection and sharing were settled and widely adopted, but I'm not sure where to start. GDPR seems a start: https://gdpr-info.eu/