It seems to me like one of the core problems will be that of volume. AI-based tools make it easy to produce essentially limitless amounts of content. The guidelines provided in Notability check before adding a release to MusicBrainz are just “the music needs to exist”.
If someone sets up a model that continuously writes MP3 files to a publicly-available server (maybe with GPT-3 generating song and album titles and Stable Diffusion or DALL-E generating album art), is all of that fair game for inclusion in MB if a human (or automated system, pursuant to the bot policy) is willing to add it?