2017
" Wow ETH is cool, we can create our own token and collect funds for our company. Let's make an ICO !!"
then people buy their token with ETH, demand for ETH increased extremely

2019
" ETH is shit, I lose everything again because investing in scam ICO, better invest on IEO"
People now dump ETH because they think ETH trend is done, now buy exchange native token like BNB, KCS, HBT, OKB for join IEO