I think it also has a bit to do with the AI sector of tech still moving at lightning speed.
Theres already models that outdo DS 4.1 flash in cost/performance. Luna 6 on max effort for example. Luna also doesn't care what time of the day it is for cost calculation.
And I'm sure by the time people ask why Luna 6 is being slept on there will be another cost/performance king
Luna is very slow and bad at agentic tasks. DS runs circles around it and there are US providers providing cheaper rates no matter the time of the day.