Usage share of different Azure CDN Providers

Question

Hello,

I've got a question from a global customer regarding the different CDN Offerings in Azure CDN (Frontdoor, Azure CDN, Akamai, Verizion).
The POP locations are published under https://learn.microsoft.com/en-us/azure/cdn/cdn-pop-locations but is there also a statement around
the usage of the different providers like x% are using Microsoft, y% are using Akamai and z% are using Verizion. I know this is pretty vague
but theire reasoning behind this is something like:
If we know beforehand which CDN Providers are the well/more established ones we will focus our POC Testing on the other ones.

Thanks,
Harald