Does anyone know why this exclusion exists? Excluded from this list are companies that were majority-controlled by an institutional investment fir

Does anyone know why this exclusion exists? Excluded from this list are companies that were majority-controlled by an institutional investment firm at one point. I presume this is why Supercell ($3B valuation) is not included, because they were at one point 51% owned by Softbank. But I can't understand why that matters.