You can log into your personal account and have iCloud file sync disabled. I mean what does that prevent that you couldnt do by some other means? I could also just use a browser to drag and drop anything to my personal google drive. Or use a usb stick.

I don’t understand people that create separate Apple accounts for work.

I’ve always used my personal account on corp laptops, including MFAANG. It’s awesome being able to use side car on my personal machines, hand-off on my AirPods, or screen mirroring to my Apple TV during conference calls. What are you gaining from isolating your account? Why even bother making a fake account at all?

If you are a decision maker, you might find your personal stuff subject to a subpoena for any number of reasons. Antitrust, insider trading, harassment suits, all sorts of legal fishing expeditions. Its convenient to be able to just give them the corporate burner, and get another. I know a few people who had to go through this with their personal phones and this is a horrible experience. For once, you lose your phone there and then and are explicitly forbidden for tampering with anything replicated to iCloud.

A friend of mine is a svp of something something and his corp was sued by antitrust regulators. One day police is at his doorstep - not even a legal letter - and they took his phone then and there. Super disruptive, considering one usually has a lot of MFA tied to the phone.

You aren't gaining or losing much - but they are gaining a huge risk. Just as you above show by being able to easily move files to any USB drive or Google Drive