Because they believe the lies from Musk?
Giga Texas
Giga Nevada
Terrafab
etc
There's plenty of examples of this company building these types of projects and following through.
Why do you think this one would be any different?
>Elon Musk Just Said Something About AI That’s Literally Incomprehensible >Sure, man.
https://futurism.com/artificial-intelligence/elon-musk-ai-in...
Futurism is a known source of easy to correct misinformation