Some even have "unlocking", had that in 2021 I remember. That means, you have the right to sell, but not all at once. So you would sell 10% per week, for 10 weeks, to sell it all. That did prevented some good ones from crashing down, but the bad ones would still crash even if everyone sold their 10% because there weren't any buyers.
You have to realize, a good project is a good project and people would want to buy into that project and when people do buy, then sellers do not matter. A bad project is a bad one, and even if you sell just a thousand dollars worth, it may crash.
So these prevention mechanics never really help with anyone, it is not the way to recover and we should always try to find a way to recover and be better.
Yes, I remember. That was a smart move by the developers. The problem with this was that many people ended up leaving the project out of desperation. Everyone wants "free money" without having to wait. It prevents airdrop hunters/farmers from dumping all of their coins at once, though.
I think the days where quality projects gave airdrops are over. Most of the airdrops you see are not really worth your time and effort. Especially when the tokens or coins you receive have no real use cases (worthless). Real money in crypto can only be made by either mining, staking, or working for it. Hopefully, newbies realize this in the long run.