On the question of language models and periphery tooling -

Open weight models are disruptive to the business models of closed model businesses. An incentive is if your business is built around X but model training is helpful to you, but you don’t expect to meter it specifically. You can release your models and undercut the exclusive moat of a new model company like OpenAI or Anthropic from becoming at some point a competitor, or holding their access as a chip in pricing negotiations. By opening your architectures and weights other competitors can build on them and newer better models emerge faster decoupled from a small number of proprietary models. This lets you focus on X while gaining overall momentum on your model release at no additional cost and no loss in focus on X, while defending against upstarts and monopolies.

This is effectively a lot of the open source world that comes from corporate development as well. It feels odd after this many decades of discussing corporate reasons to participate in open source we keep rehashing it.