It’s mainly due to PA Semi acquisition. These guys were the ones responsible of making excellent PowerPC processors, which were similar to what ARM has now.
These guys are probably happier now that they have more resources, target devices and tightly coupled software.
Basically, US is an extortionate country. At least it has become one thanks to piss hair.
“If you give money to an extortionist, they will come back for more”
It’s not a negotiation and Japan, as any other country in the world, should not give in.