If it’s an in-house engine, meaning the engine was developed by the company that also makes the game, then they may show it to essentially advertise another product of the company.
If it’s a 3rd party engine that the developers licensed for the development of a game, they are likely showing it out of legal obligation. It is probably stated in the licensing agreement that the engine’s logo must be shown somewhere in the game, usually at the very start. That’s not true for all engines and all licenses, of course.
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