Become a member at 
@yimbyaction what is your privacy policy on singing up? It’s not specified on the web page, and you ask for a lot of information.
(I’m asking in the context of one of your “location” pages)
We use it to contact you for relevant action alerts, for projects and such in your area. We sometimes share email and zip with relevant local clubs so they can ask you to join. So, if you live in the Richmond, you'd get an invite to Grow the Richmond. We never sell data.