Wasn't it in the interest of the French king to confiscate the Catholic Church just like the English crown did?
As always more can be said, and hopefully someone will add to this, but u/dromio05 and I answered a very similar question a couple of years ago:
My answers aren't entirely about France, but they do address France, as well as the general question of why all kings didn't necessarily benefit from reformation, so hopefully they will be helpful to you!