I don't know if I would want to trust the wisdom of crowds in this instance. For one, they're looking for confirmation on something they have time to observe, whereas in past years they were busy living normal lives and not spending their time observing.It's largely driven by user-generated content on the "Body Politic" support group and reddit's "covid19positive" board. Maybe there are other boards as well.
A survey by King's College London found about 10% of younger corona patients have months-long illness.
And the survey by King's College, it likely has no frame of reference to past years, because in past years no one cares for such information.