When you promote the Unlicense you should be aware that it's reception in legal circles is not great. Source

Google does not allow contributions to projects under public domain equivalent licenses like the Unlicense (and CC0), while allowing contributions to 0BSD licensed and US government PD projects.[13]

Instead i suggest you promote the 0BSD license. Both licenses are public domain equivalent licenses, so they are interchangeable, however licensing ones code under 0BSD makes it easier for companies to use it, as the BSD license family is well understood by software lawyers and 0BSD is an derivative of this license.