+1 on this,
I have been working with Sugar Labs as a member where we were building various AI-focused activities, and because every activity needed an API key we developed a common place from where all the AI activities can take the API Meaning the user can submit their API key at one place and then use that API key to access all the activities.
I was literally thinking the 1st and 4th projects sounded similar or related, and the same goes for the 2nd and 3rd ones.
And then having a shared server for this users submit their API key once and all have common vector database and can access all the features, rather than enabling everything individually.