XL Recordings came from the rave scene, the Prodigy were their first big earning group, however, for every Prodigy there were scores of 'Dome Patrol' grade releases that nobody except for DJs ever heard of. XL moved on when the rave scene died to other acts in different genres. They 'pivoted' to use the parlance.

I know Adele worked with a label however it was a genuine thing her getting spotted on mySpace and not some fake back story, as per the Lily Allen example. I don't believe music executives really would listen if I posted my singing efforts to the internets, or if anyone here did likewise. Yet that did happen with Adele.