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> Wonder if this is just the tip of an iceberg? What other industries might be doing similar things?

Not SaaS specifically, but basically all of healthcare is monopolized through hospital group purchasing organizations.

Not sure about stateside but can confirm in Europe the competition law regulators are very hot on this - SaaS platforms being used (willingly or unwittingly) as hub & spoke cartels

Retail for one, all under the mask of “AI”. Just google “pricing optimization software”.

https://www.trustradius.com/pricing-optimization