What eats kelp?

I'm curious, what kind of creatures feed on kelp? Could you elaborate on the marine life that consumes this seaweed? Are there specific animals known to have kelp as their primary food source? Or is it a more widespread feeding habit among various marine species? I'm also interested in whether humans have any uses for kelp beyond consumption, perhaps in the realm of cryptocurrency or finance? It seems an unusual connection, but I'm always fascinated by the diverse applications of natural resources. Could you provide some insights into this matter?