It's their plan, to exploit the Marek effect: For ever more lethal variants of the China virus to arise and proliferate within the vaccinated population, which will continuously spread these strains that are supposed to become increasingly lethal to unvaccinated people. Making it ultimately impossible for anyone to exist without their vaccination. And because immunity is conferred for a very limited timeframe, these shots will need to be refreshed over and over.
If they are successful in their plan, they will gain ultimate control over life and death of every human being on Earth.
The movie "In Time" explains the basic concept pretty well.