An Australian billionaire is earning praise online after transforming former cattle-grazing and logging land into a wildlife refuge. According to a report from the Sydney Morning Herald, Mike Gregg, an early backer of software company WiseTech Global, and his wife, Sue, have donated $10 million to buy 7,000 hectares of cattle and logging land to turn it into a nature reserve. "We found we had made a bit more money than we ever thought we would…