The first reason people are Investing in the Ethereum is because it is trusted project it has long term goals and utilities, it has top rank in market and it is less volatile. Those people who want to convert their 100$ into 100k$, I am fully sure they are not investing they are placing bet as they are gambling in Crypto Market. Only shitcoin or Meme Coin can give this type of Profit when it is over hyped.
So be careful with your Investment.
That is definitely gambling if someone is trying to turn their 100 dollars into 100k, however if you look back (which is a futile thing right now) you could have just bought bitcoin at 50 dollars and bought 2 of them that would be 100 dollars, and right now it is getting closer to 100k.
You can do that similarly with some other coins as well, but not as clear as this one. Like I remember a period when ETH was 10 bucks, and that means 10 eth, but that is like not even 50k right now, or BNB was like 7 bucks, and you could have bought a bit more but that is not even 30k right now. So it is not really the same except bitcoin, which actually did it.