These music generators squirt out aggressively mediocre melodies with hard cringe lyrics.
I have seen them used for mostly cyber bullying so far. Some unlucky schoolchildren are going to have peers generate an entire CD of how much they are disliked.
Melodio and Mureka are gonna get whacked with lawsuits like Suno and Udio did - Mureka's "reference clip" model sounds like a goldmine of uncleared samples, whilst Melodio is almost certainly gonna "accidentally" recreate a copyrighted track at some point.
This is gonna produce another wave of musical slop that people are gonna have to wade through to find the good stuff, though with how thoroughly mediocre it is, people should hopefully recognise it quickly and tune it out (alongside anyone who tries passing it off as their own work)
This is probably also gonna give more stock to a public notion of creativity being an inherently human thing - even in the "mashing existing stuff together" sense of art, so far only humans have managed to mash existing stuff together and make it sound/look good.