bbPress.org

You aren’t inside a function so there’s no need to globalise $bbdb.

This will get you every user (including all meta) into the array $users:

$user_ids = $bbdb->get_col( "SELECT ID FROM $bbdb->users WHERE user_status = 0 ORDER BY id;", 0 );

$users = bb_get_user( $user_ids );

print_r( $users );