From the beginning, there has not been a COVID-19 vaccine that purported to be 100% effective. There are vanishingly few vaccines that provide 100% immunity, if for no other reason than the immune system is not perfect.
In human history, we have only completely removed 1 virus from humanity: smallpox. That is literally the only 100% effective vaccine ever produced. And even then, it is only 100% effective after the fact.
From the beginning, there has not been a COVID-19 vaccine that purported to be 100% effective. There are vanishingly few vaccines that provide 100% immunity, if for no other reason than the immune system is not perfect.
In human history, we have only completely removed 1 virus from humanity: smallpox. That is literally the only 100% effective vaccine ever produced. And even then, it is only 100% effective after the fact.