It’s not intuitive to navigate. I’m not going to remember every username after taking several hours to scroll through each page. If there isn’t a system in place to auto-reject images with certain artist names, there ought to be. The rules sound like staff puts so much responsibility on the user to double-check whether or not they can repost the art. Even if you got permission, it’s possible the artist set a DNP criteria they forgot about or their username changed. Not much you can do about usernames changing, but either word the warning less intimidatingly or rework the DNP page. Reposting is often a priority of boorus, and some artists who’d dislike reposts die before they can complain, so unless you force everyone to ask for permission before reposting (like some sites do) or at LEAST make an easy-to-navigate DNI page, it’s a strange attitude.
I’m not saying staff HAVE to do this or that I’m entitled to post random art I find without asking for permission, but there’s no rule stating that you HAVE to ask for permission while the attitude implies the mods are ready to ban.