Earlier quoted context omitted.
I'm not sure what's keeping LeCun at Meta at this point. I can imagine he's not happy with Zuck's capitulation. I'm sure you're right that if he decided to leave he'd easily be able to get funding. I'm sure France would be willing to set him up with an AI research lab to get him back there. And there would be plenty of other companies/labs that would be trying to get him.
I've seen him on record that he'd pretty much work for whoever pays him (in the context of research grants for military). Virtue signaling to feel good is only worth so much to people. Humans compartmentalize very well.
I would never work at Meta, not because refusing to do so would make me feel good, but because working there would make me feel like I'm making the world a worse place.