With BuddyPress Simple Terms And Conditions it is easy to extend the BuddyPress registration page with your terms and conditions.

This is a plugin that adds legal and privacy policy pages to your website.

Create Terms & Conditions, Privacy Policy for your WordPress. Add disclaimers for affiliate links. And more.

This plugin adds a TOS (Terms of Service) field on the multisite signup form. (Such as wordpress.com TOS field)

Generates "Terms Of Service" and "Privacy Policy" texts based on your information using shortcodes.