I'm not going to argue Meta doesn't have a profit incentive here, but if they just wanted to slow down their rivals they could have closed source their model and released their own product using the model, or shared it with a dozen or so promising startups. They gain nothing by open sourcing, but did it anyway. Whatever their motivations, at the end of the day they opened sourced a model, so good for them.

I really dislike being in the position of defending Meta, but the world is not all black and white, there are no good guys and bad guys. Meta is capable of doing good things, and maybe overtime they'll build a positive reputation. I honestly think they are tired of being the shitty evil company that everyone hates, who is best known for a shitty product nobody but boomers uses, and have been searching for years now for a path forward. I think threads, including Activitypub, and Llama are evidence that their exploring a different direction. Will they live up to their commitments on both Activitypub and open source, I don't know, and I think it's totally fair to be skeptical, but I'm willing to keep an open mind and acknowledge when they do good things and move in the right direction.