It does seem crazy to me, given he lived in Sweden, where copyright transfers only economic rights, not moral rights (such as the right to be identified as the creator of a work), but allows the author to waive their moral rights, that he would waive his moral rights.
In any case, he seems pretty miserable, regardless of his twitter outbursts.
For most game developers, getting a credit on a game is not a creative badge of honour, it is sometimes the only hard proof that they worked on a title. It’s part of their portfolio and often essential for their future career and earning potential. This is why they fight so hard for a credit that is essentially free for a company to give.
Everybody knows Notch made Minecraft. He no longer depends on the credit for his future earnings. He chose to give it up.
[1]: https://www.minecraft.net/en-us/credits (ctrl+f "Markus Persson") [2]: https://minecraft.wiki/w/Java_Edition_19w13a#General_2
That's a pretty disingenuous take. Here are some examples of his social media:
"If you're against the concept of #HeterosexualPrideDay, you're a complete fucking cunt and deserve to be shot" [0]
He believed in PizzaGate[1][2].
He's tweeted in support of QAnon [3].
There's an easy way to avoid a fall from grace: Don't turn into a right-wing nutjob. Just stay out of politics and social commentary in general.
[0] https://fortune.com/2017/07/02/minecraft-markus-persson-homo...
[1] https://en.wikipedia.org/wiki/Pizzagate_conspiracy_theory
[2] https://www.dailydot.com/unclick/minecraft-creator-pizzagate...
[3] https://www.newsweek.com/minecraft-notch-controversy-twitter...