They are incentivised because showing accurate results for what you asked for isn't necessarily the best way to keep people on the platform.
By pushing certain types of videos, such as opinionated content or loud shouty videos for low attention spans, YouTube hopes to keep you engaged for longer than they would by being accurate.
There's also a direct advertising reason to funnel certain types of video. YouTube creators earn different amounts of money for the same number of views depeding on what category (e.g. financial, gaming, writing advice, cookery etc) YT has auto-categorised your video as. We can infer from this that advertisers are willing to pay more money for ads in some categories than others, and therefore YT is directly incentivised to push those more lucrative categories in search results, even if they aren't what you wanted.
Plenty of reasons why they want to mess with results.
To me, the unspoken premise of the game is that you're a kid in 1986 with a parent or cool uncle who went on a business trip to Japan and brought you home a Famicom and a copy of the original Zelda - months before the console even launched outside Japan.
The 'Alien Language' game manual is therefore supposed to mimic the feeling of trying to read the Japanese manual that came with the game, muddling through as best you can with the pictures, and a few random English words they included just because English is 'cool' in a gaming context.
It's a very fun mechanic, and my favourite thing about the game.