Companies want customers, as a business decision is makes sense to require vaccinations because if they check that means governments will let them open. Ticketmaster wants to get whatever the big name acts are on stage with a full house. If they check vaccination status they can sell out a large auditoriums in February to nurses and a few lucky others. If they wait until governments allow large venues to open up they might be waiting until next fall. That is a large amount of money they are leaving on the table. Likewise, Quantas flys international to places that lockdown as eliminated covid - if they check vaccine status they can fly anyone in without worry about restrictions. So it makes business sense.