At least for America, the 3 Covid vaccines all failed to show any actual evidence of protection or immunity, even though the FDA grant an emergency use and later approval.
I have come to the conclusion the vaccines saved virtually no one and has put a similar number into an early death (e g. The clot shot). It would've probably been better if they never existed since people were fired to take useless experimental medical drugs with no proven positive effects.
The real thing that causes Covid to go away was Omricon, and other viruses re-spreading, political attention spans, and an upcoming election where the incumbent can't continue to use Covid as a reason for election.