While this is true they wasn't so different before compared to Google and even Microsoft in later years. Other companies also released a lot of open source soft

While this is true they wasn't so different before compared to Google and even Microsoft in later years. Other companies also released a lot of open source software. AI research is different though. Everyone else decided against open source and started to dig their own moats justifying it with different kind of BS. Yet Facebook / Meta has decided to be on side of open innovations.