Distributors can't sell parts they don't have in stock or can't get from the manufacturer.
Don't blame Mouser et al because they can't get parts for you.
High volume customers are buying up all the parts they can direct from Intel.
And it is not different sourcing parts from AMD/Xilinx.
High volume customers are buying up all the parts they can direct from Xilinx.
It is a semiconductor industry capacity problem.
Lots of these parts are all built at the same TSMC fabs, which is wafer thruput constrained.
Welcome to 2022. They say it will be be better by 2024.