She's just gaming a system that rewards her output. Whether the advertisers are getting a good return on investment is debatable, but apparently they are convinced that advertising on her channel is worth it.
The only drawback is that she might be investing a good part of her career in something that may prove prone to inflation and whim.
She publishes all her "songs" on Youtube for free, and lives off sponsored content on Instagram and media appearances.
Is she lazy and getting "free-money"? no.
Is she talented? also no.