1. Legal: It's the site owners integrating GA and therefore taking on the liabilities just like they do with every other supplier. When a part in your car fails immediately after you bought it, it's the manufacturers job to fix it even if they acquired the parts from a third party (e.g. Bosch).
2. Practical: A website 100% located in France and catering to 100% french customers is much more likely to fix the problem than the international anonymous machine that is Google.