Actually, they publish very credible and well-researched comparative analysis on many vendors like SAP, Oracle, IBM, AWS, and GCP.
From their content, it's clear they have strong SAP and Oracle expertise. They obviously get paid by customers not vendors because they don't publish any marketing fluff like Forbes and other paid IT media.
They also have a number of published books on cloud computing and open source.
https://www.amazon.com/gp/product/1939731178
https://www.amazon.com/Public-Cloud-Revolution-Explanations-Premises-ebook/dp/B07N2NVX46/
Real independent analysis is hard to find nowadays. There's much more money in promoting vendors.