They don’t. I’m sure there was an argument for why they needed it in the past but that’s not the case anymore. There has been some momentum in school districts where I’m at to purge SSN from their systems but it’s an opt in type of thing.

Some people put it on crackers but when I was growing up we always put it in the bugles chips.

That is also why I always thought people who pretended to have witch nails by wearing bugles were weird, I was always like “why would you put cheese all over your fingers…”.

His personal account should be untouched, as someone else mentioned it is done by user, not device. The only thing I would worry about is the possibility of the district blocking personal devices in the future. I’ve never actually bothered to look if it is a setting in Google admin.

The overall scenario is something I’ve done personally. I provided my nephews with Chromebook’s and they are able to switch between accounts. The district has a log of the device but nothing of any real use beyond that.