[Request] Rules against promotional spamming

I've noticed the album Responsible People by Droopies being posted here about once a week or so, and I've come to suspect that it's probably a member of the band posting (it's frequently several bandcamp "yum" codes being provided). I don't have anything against bands promoting themselves, but doing it in this sub seems to me a little deceptive as well as not really in line with the sub's intended purpose. I dunno, I'm not a huge fan of it but obviously I can't speak for the entirety of the sub so I'd like to hear what y'all think.