That is only true with a very small, very richly valued group of technology stocks. You're talking about a few dozen companies max per year. Using that small group to extrapolate a claim that therefore IPOs are now primarily used to exit shareholders, is clearly a dramatic overreach.

Pharma & biotech companies as one example (the market has seen far more IPOs in that sector over the last year than it has large tech companies using their IPO as an exit), are still very frequently doing IPOs so they can raise operational cash to burn and to use their public stock for funding and acquisitions later.