Google opensourced Tensorflow because they believed it would help with the hiring process: if researchers could use the same framework to do their PhDs as Google used in their production systems, that was seen as an advantage.

Maybe that's Meta's play here? Maybe the idea is that the ecosystem around a model could be as valuable or more valuable than the model itself too, so an OSS model could benefit Meta a lot more by gaining more of the ecosystem mind share?

Or Maybe Yann LeCun is just a hippie that dreams of free love, hard drugs and open-source models?