dependent on game assets from asset stores?

dependent on game assets from asset stores?

I'm a pixel artist for gaming and I'm curious how other game developers being dependent on asset stores.I'm currently doing freelancing and want to try enter the asset store market.

I've been wondering that why buy game asset from stores if there are lot of others that are for free?

(i posted this too on reddit. mentioning it now just in case someone did saw the same question before)