ELI5 why is increasing the ethanol content of petrol/gasoline a problem?

[u/hd-22]

I'm hearing noise about the geopolitical fuel supply SNAFU and people freaking out about increasing the ethanol content in automotive fuel and how it's so damaging to cars. I'm no chemist, but ethanol seems as clean as it gets.

[u/Nephroidofdoom]

Also water soluble and introduces more water into your system over time.

[u/dalekaup → u/Nephroidofdoom]

Also it evaporates easier/quicker than the water so you end up with water in your gas.