Different types of collaboration / communications on top of Delta Chat

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There is already a thread about building a social network on top of email:

New/old social network

Might Delta Chat be adapted to become a social network with just minor modifications as an alternative to Facebook. As a social network it has the benefits that all your contacts are already on it, and, you have an existing history with them in your inbox/email server. The usual problem with new social networks is encouraging friends away from existing ones. None of your friends & family want to leave because all their friends and family are in it, etc etc Catch 22. Most social networking con…

As I replied there, I don’t think email is suitable for such projects as it only allows you to “push” messages, but does not support “pull”/publish/subscribe model. If you want a federated social network or federated collaboration platform, ActivityPub looks much more suitable. There are multiple compatible implementations such as Mastodon and Pleroma already, and I think it’s better to support them rather than trying to build another incompatible solution. As for federated GitHub, there is a ForgeFed in development, and sourcehut supports email-based development model.