First, they are one of the only medical products that are not prescribed to treat a disease. They are medical products that are designed after the very profitable insurance industry, by selling a product based on fear of what might happen to you in the future. As such, they can be prescribed to EVERYONE, unlike other medical products that require sick people to sell a drug to for curing their illness.
But unlike the insurance industry which must pay out claims to their clients when the condition that is being insured against happens, the pharmaceutical industry pays NO CLAIMS if their product does not prevent the disease that the vaccine was promised to prevent, and the pharmaceutical vaccine industry is the only industry in the United States that cannot be held legally liable if their product harms or kills their customer.
Universal repeat vaccinations for everyone has always been the goal for the vaccine pushers. Their first attempt at repeat universal vaccine products was the annual flu shot, but when people stopped becoming afraid of the flu and vaccination rates dropped, they needed something that created more fear, and that something became COVID-19. See:
BOMBSHELL: Video Emerges Where Fauci and Others Planned for a "Universal mRNA Flu Vaccine" Which Became the "COVID-19 mRNA Vaccine" Because People were not Afraid Enough of the Flu Virus
Starting in China at the end of 2019, the great COVID-19 scam worked probably better than the Globalists had even anticipated, and most of the world's population ran out to get the COVID vaccines about a year later. Then the vaccine was mandated in most places as a condition to continue with employment, to further increase distribution of the universal COVID vaccine.