Germa and Fire tank pirates didn't work under him, and that is not a reason for getting a 1.5 BILLION beli bounty, how fucking ridiculous do you have to be.
You need personal strength to back up your bounty, you can have an inflated, or unrepresentative low bounty, but Oda doesn't give Luffy inflated bounties and uses his bounty as a metric to compare him to the world, because he is the fucking main character and the bounty system is most important in relation to HIM.
Oda: decides to sky rocket post WCI Luffy past any shown YC, and literally call him the 5th emperor.
zorotards: b-b-but King is stronger than Luffy somehow