IIRC using gas with ethanol in it was considered to be more harmful to small engines found in motorcycles, lawnmowers, etc. than larger car and truck engines. The libs hate things such as mowers, leaf blowers, ATV’s, motorcycles even more than cars in many cases.
It’s not really inside of the engine where the most damage is done, it’s in the fuel delivery system. It damages the seals, o-rings, and the soft rubber parts, especially in small engines that weren’t designed to run alchohol based fuels. Alchohol also absorbs water, which causes corrosion in metal parts of the fuel system if not designed to handle it. And because of its low ignition energy, alchohol based fuels are prone to pre-ignition if the wrong heat range spark plugs and ignition timing are used. Don’t get me wrong, alchohol is a good fuel, IF the engine is designed to only burn alchohol. You can’t have it both ways with different fuels.