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It's also bad for them to be playing the game on their channels anyway. Their channels are watched by kids and they know that, which encourages kids to be in the fandom and play the game. If dev doesn't want kids to be playing his game, then why is he so comfortable with them playing the game on their channels? Even getting mulberry to draw bjuu mike "magical boy" fanart for beating the minigame first. Probably because they encourage kids to give him some patreon moneyz
He's had these models for too long so you can barely even call them placeholders at this point. When someone sees these unity models, the first thing their mind goes to is Yandere Simulator. A placeholder is... 2 years at the very most? But it's been almost 6 years and we still havent seen any significant changes in the models. They still look like the unity ones. Watashi no Mono has replaced pretty much every model from Yandere simulator and it's only been in development for 2 years.
The game was originally meant to be just a simulator, a sandbox, that's it. It's what it became popular for, and people still treat it like one. The moment he started adding many story-based aspects to the game was when it went downhill. If he wants the game to be taken seriously then why add so many easter eggs? Why name it a simulator in the first place?