in case you don't know, some Gameboy games required to have Nintendo logo in the game data as part of copy protection. allegedly that was legal protection against bootlegs.

https://www.copetti.org/writings/consoles/game-boy/#anti-pir...

Playstation2 used something similar. ( https://github.com/mlafeldt/ps2logo )

I suppose it gave companies in question additional legal leverage - they could not distribute copies of games without violating the trademark laws.