Imagine being a professional fighter. Making living off fighting. Now, as a professional fighter, you have to train at least twice per day at your team's gym. Or any other gym, as long as it has the equipment and everything you need for your professional training. If you don't have a certificate, the covid pass, if you're basically not vaccinated - you can not enter the gym. Matter of fact, any of them. So, in order to get back to money-making and building your career, it's a must to take a vaccine. That's just one example.
Regardless, sooner or later it will be a must for every single human being out there, can't escape that.