Sounds like an overly pessimistic view. You IPO to allow early investors to exit and raise capital to expand. There are a lot of very successful IPOs from before 2020 and some of those that went public in the last two years will be ok
The most successful IPOs for the company are where it sells a bunch of stock at prices that then stay steady or even go down, they traded (potentially worthless) paper for real cash. I suspect the majority of IPOs are "successful" in the second way even though they're "sold" as being (a chance?) at the first way.