Because users are fighting to pay more for AI...
No reason for ARM to do anything other than surf the bubble, as the GAFA lemmings invest tonnes in stuff that we will not pay a penny more for than we did last year. Add an AI surcharge and everyone will just buy less. AI is going to increase overheads for anyone mug enough to join in, without increasing revenue. A bit like the transition to nextG. Lots of extra investment. People spending the same.
Boasting about increasing revenue on licensing (30%) when phone manufacturers are not really making much more (2%) is unwise. Those license fees are 100% dependent on the manufacturers' revenue streams.
It isn't really artificial intelligence. It has only niche value. You are all being conned. But hey, make as much from the bubble whilst you can, with a fast, clean exit strategy for when it deflates.