This market will require a bit of nuance, as the names may change. I intend to focus on the category that more closely resembles Azure, AWS, and GCP. It's right now called IaaS (infrastructure as a service) by Gartner, they estimate that 2022, the spending was $115B. This would require a $460B estimate by then if they don't revise the $115B estimate. This will mean a 15% CAGR from 2022.

This is the current Gartner estimate (27% growth in '22, 29% growth in '23) :

I won't bet here.