I believe that if we dedicate more resources specifically to French publications and support this in more than the usual way, we can increase the attractiveness of publishing and submitting these requests in French.
The cost may sometimes be higher when it comes to journal publishing, which is the space I work in. I know that there are additional fees for translation, for instance. Sometimes journals attract manuscripts in English and then translate these in order to publish the original research in their journal to make it an attractive journal. To have good applicants, they need to do so, but these are additional funds and additional costs, and they really need to decide to spend or not to spend on these things.