I don't know if it's an EU rule, but in my (European) country cars are required to have their lights on at all times, even during the day. The lights switch on automatically when you start the car
I'm baffled that daytime running lights are not mandatory on all models of all cars in 2025. My 13 year old Grand Caravan has them, though I suspect it's because it comes from the Daimler Chrysler era.
I love to baselessly praise europe as much as the next idiot in the comments but most North American models that got DRLs before it was legally required got them because they've been required in Canada since the 90s
After I visited Iceland where it's mandatory, I liked the improved visibility so much I turn my lights on for every single trip. It was not a takeaway I was expecting to have from the trip.
It's a good idea in some places. An overcast winter's day in the North isn't that well lit by default.