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Half of US public companies, 64% of fortune 500. It's generally recognized as a corporation-friendly location.

https://technical.ly/delaware/2014/09/23/why-delaware-incorp...

It's a tax haven that doesn't tax earnings derived from 'intangible assets' (e.g. licensing fees that "Widget Co. California" pays to "Widget Co. Delaware" for using the trademarked Widget Co. logo).

Yes, but not all. For instance, Microsoft and Apple aren't.

Interestingly, Microsoft was:

Q.What year and where was Microsoft incorporated? A.Microsoft was incorporated in the state of Washington on June 25, 1981; reincorporated in the state of Delaware on September 19, 1986; and reincorporated in the state of Washington on November 1, 1993.

https://www.microsoft.com/en-us/Investor/FAQ.aspx#section_2