If you are a seller in Paris, I am not going to show your apartement or house on my website to my buying clients. Why ?
Because the flaw with real estate agencies in France is that, in a real estate transaction, a regular french agency represent both the buyer and the seller. A bit like a lawyer who would try to defend and prosecute the same person. It’s not possible !
So, instead, I will put your apartement on the french version of the multiple list and make it widely available so everybody can see it. That way, it won’t be my clients buying it from you and I’ll be free to defend your interest and sell it for a good price !