Couldn't you use it in large tanks to suck out CO² directly from the air? What makes this more expensive than currently proposed alternatives? Even if you don't

Couldn't you use it in large tanks to suck out CO² directly from the air? What makes this more expensive than currently proposed alternatives? Even if you don't use the seaweed in the end, you could just dry and bury it I guess? EDIT: After some research I found an interesting article addressing this: https://www.technologyreview.com/2021/09/19/1035889/kelp-carbon-removal-seaweed-sinking-climate-change/ https://www.technologyreview.com/2021/09/19/1035889/kelp-car...