Not surprising though.
Remember AF corporate culture about upgrades which AF hates (other than for F&F).
The motto was "if we upgrade pax, they will stop buying biz class".
​​​​Management has tried to impose paid upgrades to the "system" which has revolted is now back to its old self: de facto no upgrades.
A bit like antibodies fighting an infection.

I was in fact talking with a FA at AF. She was saying that the biz class cabin was now always full as AF was selling cheap upgrades as well as with miles in the cabin. She mentioned that "real" upgrades (that is to say for free) were now almost impossible. It means that F&F would have a hard time, which the system would certainly not tolerate long.