This VC looks at this idea, figures out that in order to own the market and make $fuckton, they'd have to spend > $fuckton. Decides to bail.
As a bootstrapper of businesses, I look at this case study and go "well yeah of course it'll take $fuckton because you're haven't focused on a narrow enough niche". Which of course they haven't because you can only make $shittons from niches, not $fucktons (where $fuckton is up to an order of magnitude larger than $shitton).
It's a very different set of expectations. $idea might not be investable as a VC, but if you can really define a specific niche, get a toehold, and patiently build from there, $idea might have merit for a bootstrapper.
(All that said I don't think this particular idea has legs based on the reasons identified in the "Regarding competition" section and also from my own limited experience in the music space).