Earthworms remove surface debris and fungal spores from the garden; they clean the garden of unwanted organic materials. Earthworms eat their own weight in organic matter and soil each day. A pound of earthworms eat a pound of organic matter and soil each day. Earthworms turn soil into humus improving soil structure.
From. https://harvesttotable.com/benefits-of-earthworms-in-the-garden/
Seasoned 
our compost is actually just worm farming. we got happening.
I do love a bit of worm farming, it’s always a joy to spend time thoughtfully adding layers to the compost heap. Not so keen on physically turning it but always love the hold at the bottom.