I wouldn’t go as far as saying it’s a scam. It’s legit in that it is currently an ecosystem that tons of things run on, but I think it has some fatal flaws that can’t be overcome. The gas fees are so out of hand right now, and ETH 2.0 is a pipe dream that is somehow always just a few months away from fixing everything.
I think DOT and ADA and maybe a couple others will eventually completely replace ETH.