Because the old “trusted” vendor is now absurdly expensive and switching to another one helps increase profit? E.g. why did organizations switch from bare metal to virtualization in the first place?
Because those policies didn’t account for the workflows of engineering and dev teams. And I’m not even really asking for them to trust 3rd parties but to instead have a workflow to escalate and petition tools and workflows to become supported in house.
For example Docker Desktop being disallowed with vigor for Windows machines because it’s a virtualization tool. But Docker is fine for Linux users. And confirmed it’s not a licensing or purchasing issue.