Bounties are based off feats, not strength.
It’s why Kuma’s bounty was less than 300 mil despite him easily being at least 1 billion in strength. His only feat was destroying bekori.
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Compared to Hancock and Crocodile, Jinbe wasn’t as dangerous. He doesn’t command a nation like Hancock and until he became a SH, he wasn’t a yonko commander like crocodile.