The cause of fire from an EV charger are the same as any other electrical fire, improperly installed and/or faulty wiring in your house.I’d be more concerned about safety than the looks tbh.
I don’t know much about EV’s, won’t be in the market for one anytime soon but I seen an indy car dealership set ablaze taking probably half a million worth of cars with it(RR’s and the like) because a Jag was left on charge(during working hours too!). Shocked me but I assume it was a poorly installed or inappropriate charger.
EV chargers are not that special, it's just a 32A socket, often connected to the internet so you can manage when it turns on from your phone.