Every year there is new thing to raise funds by new projects.
In start they raised funds easily without any hype.
Then they started promotion and bounties, paid influencers, hold lottery systems for whitelist  to create FOMO and raise money.
When ICOs trend vanished even after all the stunts, they were replaced with IEOs by big exchanges with guaranteed listing after IEO. So people saying when binance, when huobi started investing in it and luckily these are giving good return 5-10x.
After some months or 1 year this trend also might be replaced with another better idea who knows.
so just follow the trend and invest smartly.