This doesn't sound foreign to me. I still remember about that day, Mariah Carey join this one.
I don't know that Mariah Carey backed this project at startup, things that I know is Mariah Carey join Geojam as Executive Advisor.
https://www.prnewswire.com/news-releases/global-superstar-mariah-carey-joins-geojam-as-executive-advisor-301181778.html