Are calls originating in France a major source of these unsolicited calls? According to the article, a lot of the calls are coming from Morocco, outside of their jurisdiction. I'm in North America and most of the calls I get are using local numbers, often spoofed from (I suspect) South and South East Asia. Good luck enforcing Canadian or American law in literal slave camps on the China-Myanmar border.
As for international scam calls, not sure what the situation is in France and what measures they have in place, but one relatively easy way is to block international callers from spoofing a local caller ID, which decimated these calls in Finland a couple of years ago: https://traficom.fi/en/news/obligations-regulation-come-effe...