“Terrified the world” with 100 million berries? If they were so terrifying why don’t they have bigger bounties?
inflation(both in and out of story)
100 mil was simply a way bigger deal a century ago. Just like how having a million dollars a hundred years ago in the United States is a much bigger deal than having a million dollars today
also, a 100 mil bounty was a really big deal back during early One Piece. It's only around post time skip it was established that 100 mil is nothing by New World standards.
Their new bounties do take account their egghead actions, but they also are obviously mostly "updating" their og bounty