In the end, you will submit personal information regarding the delivery. It is unavoidable. It just depends on this site whether it has some kind of database to record and store those addresses.

How to ensure the legitimacy of the sellers? In general, the marketplace acts as an escrow to secure buyer funds. If the user has full control, does that mean you don't want to interfere with user problems? I've read your WP (p. 7, "Additional protections for buyers and sellers"), but found no explanation of your role as a protector if users have issues, especially fraud.