Nintendo went after streamers early on. They are frequently one of the most anti-consumer companies out there despite having this beloved image. They make incredible properties that we all love, but they shit on consumers constantly.
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I’m not familiar with the specific glitches that were patched, but you could argue that glitches could be pretty harmful due to the nature of Mario Maker since you have to be able to beat a level yourself to be able to submit it online.