Vendor lock in is always a thing really, you don't always get choice in SaaS providers and how they auth. Could of course choose another SaaS provider but then that starts reducing the pool, assuming you have alternatives.

> Vendor lock in is always a thing really

Yeah, and additionally if all your counterparties are on it, you can externalise your internal tools onto them relatively easily.

This mostly doesn't work, but it's a beautiful dream for executives.