Final answer:
Cadmus is seen as a 'first finder' because he introduced the Phoenician alphabet to Greece and created the Spartoi warriors from dragon's teeth, making him a pioneer in Greek mythology.
Step-by-step explanation:
Cadmus can be viewed as a 'first finder' in the context of Greek mythology and legend. He is noted for several 'firsts', including introducing the Phoenician alphabet to Greece, which was a crucial step in the development of Greek literature and literacy. Additionally, Cadmus is a figure who, according to myth, sowed dragon's teeth that sprang up into fully armed warriors, known as the Spartoi. These warriors can be seen as a 'discovery' or creation of a new class of men birthed from the earth itself.
In the broader cultural and metaphorical sense, Cadmus represents the archetype of an innovative foundation-bringer, a pioneer who brings new knowledge or technology to a people, catalyzing progress in the civilization. This role as a 'first finder' aligns him with other mythical inventors and cultural heroes who 'found out knowledge and used it for the betterment of life'.