But yes, it's certainly true that if Djokovic wasn't such a high profile figure, and if he had decided to stay at home, then Voracova and others would have been able to remain in Australia, and to play tennis.
The way I view it is that Australia allowed in some players in who shouldn't have been allowed according to the law, but no-one really noticed and so no-one made a fuss. But as soon as Djokovic got involved it all became very high profile, and the political wrangling started, everything got brought into the open, and so Voracova has now been deported, Djokovic is awaiting his legal hearing, and all other tennis players who were granted an exemption are now being investigated.
The fact is that Djokovic and other players should not be allowed in if they aren't vaccinated and don't have legitimate medical reasons for this; this is the policy, and it should have been adhered too. But it wasn't, and no-one really noticed this until Djokovic got involved, and now it's become all about political positioning. But regardless, he doesn't meet the criteria for entry.
I think that you have a point. Maybe these things happen often now and then, as there is a chance that the fed often allows players who are not vaccinated, but it goes unnoticed but as a high profile player like Djokovic did the same thing, the media boomed with the news and it went viral.
But whatever the case might be, a player as high profile as Djokovic should not be breaking the law and rules and it's quite disappointing.