Multiple users doing different things on what _appears_ to be a common box has become pretty rare, I will grant (although that lovely Slack-in-five-lines-of-shell thing that was recently posted maybe here, maybe not, was very cute).

But of course almost everything that's not happening inside your own house or your own on-prem data center is many, many, many users on a single box, each virtualized somehow (whether that be a classical VM, or a paravirt KVM guest, or just an OCI container) so each user has the experience of having a machine to themself.

It's like it's 1967 again!  Welcome to CP/40!