This thread seems to be conflating two different issues: notability and fraudulent/incorrect entries.
We don’t need to create/adjust a notability policy to deal with fraudulent/incorrect entries.
Also, even if someone is creating music just for the purposes of promoting some non-music enterprise, I’d argue that’s not necessarily reason to exclude them from musicbrainz.
And…
I’m not sure you can (even if I thought you should) craft a policy to address this that wouldn’t exclude entries such as John Cage’s (in)famous 4’33" and/or the entire “harsh noise music” genre.
Also, I’m amused by the idea of someone using Musicbrainz for SEO considering that we can’t even get google to index MusicBrainz properly