Why do u think so?.
If oda wanted to give jinbo this high bounty, he should have made him fight atleast jack. Jinbo left warlords 2 years ago. He had a 400+mil bounty then. Then he joined a Yonko, bogmom. As far as we know, this didn't increase his bounty at all.
But then, he gets a humongous increase when he joins strawhats. What's the logic in that?. And it doesn't make sense for it to be because of warlord hype either. Cause he left warlords 2 years ago as mentioned above.
He got the "warlords are the new danger" boost.
2 years ago, and you saw then in the scenes with the Gorosei, they understood his actions were to protect FI, so his raise, if at all, was minimal. Joining BM was to protect Fishman Island, also understandable. He basically did everything to protect FI and otherwise chilled.
But now pretty much all the warlords, including him, directly oppose the WG, in his case by joining their natural enemy, Nika.
So it is a declaration by Jinbe regarding his intentions.
And since strength-wise, he fits at least in that spectrum, and now he opposes the WG, he gets a huge raise.
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Yep. I said it a long time ago, but the bounties were really messed up when Blackbeard only had around 2 Billion for all that he did while the other Yonko had 4-5.
The recent events only make it look even more ridiculous.
Even that is ok because the bounties add up over time, you get specific raises for specific deeds.
What BB did to get to 2 billion was not on par with what the other three did in their careers in terms of strength, danger to WG and so forth.