France is a bit in a weird spot animation wise. We have a great pedigree and good schools, but our production has to be sold to french speaking countries, so mostly for north african countries (former french colonies) and thus most animated project for tv must respect their sensibilities so we end up with totally bland and inoffensive children program and that doesn't sell dreams for future animators that are looking for a career.
On the other side, we have Illumination Studio or Fortiche (Arcane) that produce bangers, and tons of video games studios that recruit and produce good shit.
TLDR : french animation is great, just not for tv.
Also, if you wonder why the japanese animation style, because France is the second largest market for manga after japan