Gather evidence against employees, use that evidence to put them under pressure to testify against their employer or grant access to evidence.

Sabu was put under pressure by the FBI, they threatened to place his kids into foster care.

That was legal. Guess what, similar things would be legal in France.

We all forget that money is nice, but nation states have real power. Western liberal democracies just rarely use it.

The same way the president of the USA can order a Drone strike on a Taliban war lord, the president of France could order Musks plane to be escorted to Paris by 3 Fighter jets.