There's a big difference between having one's name and address appear on a public land registry database, vs just handing it to an SF tech startup. At some point that data will monetized. Remember unroll.me? [0]

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...