Even Spotify admits that it’s a problem. Unlike MelOn, which requires a Korean social security number to get a phone # connected to an account, Spotify is open to tons of countries around the world.
There will always be businesses that figure out ways to manipulate so they can profit. It’s a million dollar industry. And there are always companies desperate to get hype for their artists. So I’d put Spotify on the level of Bugs or Apple Music in terms of reliable success measure compared to MelOn.