"If all of this was done to better humanity, AI development would be done in public, data would be legally obtained, models would be released for free, access wouldn't be gatekept behind ever increasing subscription costs." The vast majority of AI development is public. There are papers literally every single day to read. In fact everything you need to build Claude and GPT models is public. Thanks to Google, DeepSeek…
Is there any mainstream model that is actually open-source (not just open-weight)?
There are, however, very few models where also the full training pipeline is available. Olmo by AI2 comes to mind.