A a changing scheme from time to time. The Pre-Market era has also begun to fade because lately the Pre-Market price is more expensive than the listing price. another reason, Pre-Market that is too long and makes investors bored.
Premarket is the worst of them all. Projects and their listing sites don't even do anything to protect the interest of investors. In most cases, tokens take undue time to get listed and when they do list, they list below price. I see this the same way as Presale and Private sale.
Just to remind you, if there a new sales method found in near future, maybe they well ended up with similar condition. so, be careful. DYOR/DWYOR/NFA
So long as a system is managed and handled by humans, there will be that element of evil. Something must corrupt the system.