The Fleet Admiral position has a 5B bounty according to the Cross Guild rank system* Akainu just happens to be the Fleet Admiral and therefore automatically get such a bounty, the same way any Admiral automatically gets 3B regardless of what the character themself has done.
And I don't care about bounties, people who use bounties to powerscale are like the ultimate litmus test for determining someone who can't powerscale for shit
That's what bountytards like yourself would have us believe is accurate