Nobody says it does. But it significantly reduces the chances of transmission. I'm astonished you didn't know that. And here's some more accurate info for you:
'A recent study of more than 44,000 people in Los Angeles found unvaccinated people were
29 times more likely than vaccinated people to end up hospitalised from COVID-19. The rate of hospitalisation among vaccinated people was 1 per 100,000 people.'
I'm vaccinated. What's my risk of catching COVID and passing it on?
Unfortunatey, my brother was one of the tiny proportion who needed hospitalisation after contracting it (in the UK) Thankfully he had received two vaccines but he was still sick enough to spend a week in hospital. If he hadn't been vaccinated I think there would have been a significant chance that he'd no longer be with us. But the hospitals are so overun with those who haven't been vaccinated (see the figures above) that he had to spend 30 hours lying in the ambulance in the hospital car park until a bed became available.
Again, I have zero sympathy for anyone who can't get into a restaurant or a theatre or a bar or who loses their job because they consider their rights to be more important than the health of others. Absolutely zero.