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This is probably different between startups and enterprises. My background is purely startups, and I can't imagine not having access to 100% of the code for the company I work.

I work at Google, and yes. We use a monorepo for absolutely everything you can think of. But good luck getting that code off a corp device without being caught!

Android never fully made it into google3. Google is big and does so much stuff and almost everything is in there but there are exceptions!

While not talked about on HN as much, the big corps doing monorepo use something like Perforce which has "protects" tables allowing very granular access control

Hosting a developer environment remotely that you SSH into is very common. That’s how you would approach working with a monorepo that has any serious size to it.