It definitely sounds like some anti-piracy stuff. Old game devs were trolls when it came to finding creative ways to deter piracy. They knew they couldn’t prevent bootlegging, but they could certainly annoy the bootleggers.

It’s why lots of anti-piracy stuff in old games only really ramps up after a few hours of gameplay. When a pirate is trying to crack a game, they don’t want to spend hours testing to see if the crack was fully successful. The game booted, so they sent it out the door. If the devs put a big obvious “we detected that you’re playing a pirated copy” warning on the title page, the cracker would obviously know that they need to take another look at their work. By burying the anti-piracy stuff behind several hours of gameplay, it means the pirate won’t be able to reliably check each version of their crack.

Especially if the game devs do something like check for a crack at multiple points throughout the game, and record it as an invisible part of your save file. It means you can’t just load a save from right before the noticeable stuff happens. Because you probably got flagged several hours ago, so loading that old save will still flag it as a pirated copy even if your crack is working now.