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When I went to college in the mid 90's, the entire campus was on a /16, flat network, every machine had a 255.255.0.0 netmask. There was no subnetting, everything was switched (they said "bridged" at the time.)

With today's switches, you could do much crazier things. Definitely not an /8 though.

I have unfortunately seen that many a time.

That's the joke! Imagine not getting caught these day running a giant routable stolen class A network on a single LAN segment. It would require Trump-level audacity!