Spoiler If MHA villains had One Piece style bounties...

RayanOO

Lazy is the way
#2
It depends if we scale them to one piece too, like biggest threat = 4/6 billions bounty etc ?
We must also take into account that this is only a Japan situation and for now the threats are not world wide, while Yonko are a threat for the entire world in One piece.

I will say that just like One piece a threat to the world is between 4 to 6B.

All for One : biggest threat, ruled quite some time, hella dangerous, lots of minions, and during a long period of time etc. But seems to only bothered Japan.
Bounty : 2B.

Shiggy (after this arc) : new huge threat, really powerful, mad, and can destroy cities like nothing. The new face of the villains. Still green but dangerous. Head of the LOV.
Bounty : 1.1B

Re Destro : people didn't know his undercover criminal/revolutionary network. But now everyone knows after the raid. If the government knows all he did, his influence, his army, his past, his powers, his financial empire, his alliance with the LOV etc, his threat level is quite high.
Bounty : 900M.

Gigantomachia : the doomsday guy, unstoppable monster, but seems stupid, and if they know that he is just Shiggy oversized dog maybe he can be less threatening by himself. But still a walking disaster.
Bounty : 700M.

Stain : not that sttrong by himself, but his threat level is his ideology, people who will follow him or be inspired by him. So he can create and did create some good disorders in the society.
Bounty : 350M.

Twice : lets say just before his death (:josad:) if the gouv had a clear idea of his threat level, sad man parade etc.
The strongest LOV member outside of Shiggy. The one man army. Can clone himself, people etc. he pose a huge threat to the country.
Bounty : 400M.
 
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