Do you really consider your address private information?
If this organization registers as a nonprofit, that's one thing. Outside of that, I wouldn't trust such services any further than I could throw a pitch deck claiming to make the world a better place, with your PII.
[0] https://www.theverge.com/2019/12/17/21027159/unroll-me-email...
There is no pitch deck for Mel as I don't intend to raise VC funding – precisely because I don't want to be pressured into doing something that goes against my values like selling user data.