Public outcry from their citizens since they have subjected to getting arrested for going to a park, even if vaccinated, when someone can get an exemption to enter the country seems wrong.
Australia got caught being hypocritical and subjecting it's citizens to ridiculous standards so then they had to take it out on Djokovic to say, see we aren't just heavy handed with our citizens, it's with everyone.
That said, seems silly to me Djokovic isn't vaxxed. He has more than enough money but he lost out on a chance for millions to grow his legacy. This is, right or wrong, be a mark on his legacy.