I think there is a difference between "IPO is fraud/scam" and "the company behind the IPO is fraud/scam".
Most ICO's I've looked at haven't produced anything but fancy blog posts (and in some cases, the DNS registration has expired). I think I've invested into 2 or 3 (didn't invest much, 10 or 50$ at most so it didn't hurt much and I stopped by now).
I'm not sure if it's meant to be sarcasm. One thing that comes to mind is a lot of shady public companies don't have an IPO, but instead do a reverse merger with a public shell or operating company. I don't know if companies with IPOs are always non-fraudulent, but I think the process goes along with a certain amount of scrutiny and conversely there are ways to avoid it.
Most ICO's I've looked at haven't produced anything but fancy blog posts (and in some cases, the DNS registration has expired). I think I've invested into 2 or 3 (didn't invest much, 10 or 50$ at most so it didn't hurt much and I stopped by now).