Bake at home ones are half that.
Cheapest "fresh" at Carrefour are 20 euro-cents.
https://www.carrefour.fr/s?q=croissant
Are village bakeries still a thing in France?
Very much so. You find bakeries in every village / town, usually less than 15 min walking in any city. I don't know many people in France who buy supermarket croissant (except when you buy very large quantities for groups for example). And it's very common for people to go to their local bakery (small, 2 or 3 employee) to buy bread every two days.
Croissants or baguettes are not a daily thing if my assumption is correct. My experience is buying them when walking home from work and if I'm in the mood because bread isn't generally healthy for people compared to something else that happens to be better.
edit: okay, I now understand the comment is about apples having natural sugar.
[0]: https://fdc.nal.usda.gov/fdc-app.html#/food-details/171688/n...
Natural sugar is magnitudes times better than processed/added sugar.
Fructose consumed through fruits has never had a similar metabolic effect as high-fructose corn syrup.
1: https://www.myfooddiary.com/foods/22930/snickers-regular-siz...
So if you go for industrial-level food production, you end up with a higher proportion of sugar than what would be considered healthy. Sugar per se ist not bad at all (try to have an apple without it ;)). But our economy demands cheap, somewhat tasty, calories. Hence we end up with a lot of sugar or carbohydrates in general.
Any diet that rules out carbs works well because of that, not because of some intrinsic property of carbs.
As a French person you would probably never consider giving up on a good croissant or baguette, but in France these things are expensive. I doubt anyone gives their kids fresh croissant before school every day.