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Lazy singers are boosted by youtubes algorithm, netting them more subs.
For example:
Marine - Streams rarely, makes high quality music videos.
Rarity boosts numbers for normal streams, and quality music videos guarentee lots of views. Youtube interprets this as popularity, so pushes her videos to a larger audience.
Vs
Koyori - Steams often and long, sucks at singing. No rarity buff, her fans can pick and choose which streams to watch, don't bother with the archive, because old streams quickly get buried. Youtube interprets this a low-engagement channel, so recommends less.