It's really about flows as well, not necessarily total throughput.
AWS Nitro allows 5G/bit per flow. And then maxes out at 25G/bit. I know GCP does something similar.
Also, pretty sure that is false regarding Azure, they have a small availability of Infiniband, but, that is not on their general compute platform and has a narrow use case/many restrictions. Azure has had the worst networking performance from my experience and only had 10GbE NICs (it's been a while though)
Sounds like a marketing blurb but from just a few days ago:
"Azure is breaking the speed barrier in cloud connectivity. ExpressRoute Direct provides 100G connectivity for customers with extreme bandwidth needs. This is 10x faster than other clouds."