In french rules, when you make a side bet the casino will either return half your bet if zero lands or carry your bet forward. Obviously this favours the player and lowers house edge.
Does anyone know any casino online that offers this?
I've never encountered this in neither physical nor online casinos but at least some crypto casinos host games where they're willing to allow for extremely low house edge like crypto dice which is one of the most classic crypto casino games with just a house edge of 1%.
So it makes me wonder why no crypto casino offers this
I know this rule, and it makes this gambling game a little more diverse. In Europe itself, it is usually found in physical casinos such as la partage. And as the author correctly noted, this rule really reduces the casino's advantage from 2.7% to 1.35% for equal bets.
Obviously, this is beneficial for the roulette player, unlike other types of standard roulette.
Why not at a crypto casino? I think it's about simplicity. It is much easier for online casinos to offer 1 percent dice to players and not bother. They still get good money due to the huge flow of people on the sites.