Depends on a bunch of factors, e.g. which booster, which variant, the person, and the relationship between dependent and independent variables in different risk

Depends on a bunch of factors, e.g. which booster, which variant, the person, and the relationship between dependent and independent variables in different risks from both COVID and the vaccine, but for the peak of the pandemic, the answer is no -- the risk of catching COVID was so large and our treatment wasn't honed in that you'd have to assume a pretty high rate of serious unknown long-term issues for it to come out net negative in most cases. Once we got past the peak and with particular variants where the boosters were less effective, that changed (and that was also when you found out that some people's belief in the vaccine was ultimately religious in nature). There weren't a lot of people trying to model that risk, but of the ones who were the vaccine looked pretty compelling as a better bet for the whole of the peak pandemic. And maybe it turns out that 15 years out from the vaccine everyone suddenly dies! But the expected value there is highly unlikely.