How much do we know? Probably not as much as we might think we know.
Could it be caused by vaccinations? Probably not. There seem to be plenty of unvaccinated people with long covid. The politicization of things might make it hard to study in general. Many of the people who were not vaccinated will insist they just had the flu, or a bad cold and would have avoided any sort of official diagnosis.
Could vaccines have made it worse? This is probably even harder to answer definitivel
Could it be caused by vaccinations? Probably not. There seem to be plenty of unvaccinated people with long covid. The politicization of things might make it hard to study in general. Many of the people who were not vaccinated will insist they just had the flu, or a bad cold and would have avoided any sort of official diagnosis.
Could vaccines have made it worse? This is probably even harder to answer definitivel