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Disney is investing $1.5b in Epic Games and building a new universe connected to Fortnite | VGC
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They did engage in buying out studios to make their games exclusive to their platform. One prominent example was Rocket League, they bought Psyonix and made them discontinue macOS and Linux support, along with delisting the game on Steam
Yeah, that is a pretty shitty, anti-consumer practice. Still not entirely sure I'd give them the award of the most unethical, but that only speaks to the absolute shittiness of corporation, really.