I see. . . What makes it reassuring is the fact that the devs will not dump what they have.

That is illogical. If they want to make a lot of money, then they want to keep the supply scarce and selling only later once the price is really high, and even then they would sell slowly.

I mean look at Facebook, I think they had their IPO after 4 years, and most profit was made by angel investors I think.

So it is usually the developers/owners selling the last time, so most profit will be made by early investors and the devs.