American tech giants such as OpenAI and Nvidia are trying to “lock in” developers to their closed-source artificial intelligence ecosystems by open-sourcing tools in other layers of the tech stack, according to a report from Chinese fintech company Ant Group.While most leading US large language models are closed-source, Chinese players from Alibaba Cloud to TikTok-owner ByteDance have instead opted to “open-source” their models, meaning that developers can download and build on top of them.A...