Because those of us in say, Berlin, are doing our damnedest to encourage them here, where we need them for our engineering teams?
Just eyeballing this would indicate going after a German or Fin would likely cost more, because 1. They have similar programs, 2. They don't care about Visas and therefore are less likely to be invested in being or staying in France long-term. If France gives me a visa you can be sure I'm there for more than just my business. 3. Language. 270+ million people speak French, so why not pull from countries and cultures that have some shared history and association.
Seems to me this makes way more sense for France than chasing down Germans, Dutch, Fins or anyone else local.