Some fuel deicers are essentially alcohol, and some of those are ethanol. In mixtures up to 10% ethanol (e.g., US mogas), engines designed to use such additives show no ill effects. OTOH, ethanol is a real problem in the recreational boating industry, where some plastic/GRP fuel tanks were NOT designed to resist alcohol attack.
There appears to be another step abuilding to increase the allowable methanol to 20% in US mogas. That may cause more problems for more engines/installations.
Airplane installations have much wider temperature and pressure extremes to deal with, as well as reliability requirements, so a minor problem in a car could become a disaster in an airplane...