ah, missed this.
(a) Think of Bind as no-code LLM app development platform using any open source models or paid APIs. There are atleast 10 good LLM/vision models, which are not OpenAI.
(b) You can create a custom API for data extraction etc (instead of an assistant)
(c) You can deploy a private instance for your company.
OpenAI - will only solve for OpenAI models and capabilities.
MS Copilot Studio - Seems focused on MS customers.