FYI, screenshot for the "Search and download Gemma 4" step on your guide is for qwen3.5, and when I searched for gemma-4 in Unsloth Studio it only shows Gemma 3 models.
Clients are supposed to check. For example, Apple requires a varying number of SCTs in order for Safari to trust server certificates. https://support.apple.com/en-us/103214
So how does that work with middleboxes? Corporate isn't about to forgo egress security (nor should they).
I don't currently MITM my LAN but my general attitude is that if something won't accept my own root certificate from the store then it's broken, disrespecting my rights, and I want nothing to do with it. Trust decisions are up to me, not some third party.
Corporate managed machines can control the software running on the computer to do anything. I'm not sure the details, but chrome certainly can support corporate MITM. There's likely some setting you have to configure first.
The default should be to reject certificates which aren't being logged, and if you as a user or corporation have a reason to use private certificates, you just configure your computer to do that. Which fully protects against the risk of normal CAs signing fraudulent certificates.
