They do not need a free advertising which translates in no views for them. Remember, they think people only read the summaries, which is totally wrong, as you can check on slashdot, where people does not even read the summary.
On the other hand, threatening french people to stop indexing french sites will not work. They will create a french baidu and they will forget about google. Nowadays, google does not have anything special, it is only popular. You can create a google clone if the original does not suit your needs.