Exactly this, market share as a percentage also isn't a big a indicator of profit either, I could have 99% of the market, but if the market is shrinking and worth $10 this year, and was worth $1000 last year then I would have preferred a 50% share last year, than what I have now.
The crypto bubble caused a huge temporary gain for sales, and as a result has actually caused sales to go the opposite way after the crash due to huge over supply in the marker for both of the major manufacturers. NVDA are trading at $148, down almost 50% in 5 months, and that is looking like it is going to continue as GPU sales are lagging behind due to the hang over from the crypto bubble, and from Nvidia a less than luke warm reception for their new technology.
Except the market still prefers Nvidia's GPUs and prices to AMD's and how ever badly Nvidia was suffering from oversupplied channel, AMD was worse, as Bourne our by the massive market share shift.
AMD need to be careful they don't fall in to irrelevance at this rate