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Its a JavaScript library used for providing an abstraction over DOM manipulation, and is open source. It doesn't phone home to facebook with your mother's maiden name, and it doesn't have a single line of network code in its source code. Worse that could happen is facebook stops supporting it for some reason and a lot of engineering talent dedicated to it evaporates.

React is an open-source freely-licensed javascript library that you can self-host, so I don't see the problem with it just because it's maintained by Facebook.

I'm honestly struggling to figure out what you even think might be the issue here – is it that you think React might be harvesting data from people's projects?

The worst thing Facebook could do to React is seize support and development (or make future development proprietary).

> cross over between the data harvesting and the engineering behind React

I'm not sure I understand what you mean here.

React does not harvest data.