Free has traffic shaping for anything going through their peering, but in particular apple and google.
Good luck using youtube via free's peering. it's nearly impossible. I don't know many people on free.fr that use youtube at all, because it's too terribly slow (1min load for 3s of video?). It's barely acceptable for things like google play downloads.
Why does Google continue to peer with them then? The whole point of peering vs. transit is that two networks will connect for free to each other to get better service.
Their peering isn't net neutral at all.