I know how to subscribe to a community on a different instance. Is there a way to subscribe to the entire instance on Beehaw, other than individually subscribing to all the communities on it?
That is not a feature, you would have to subscribe to the communities individually - that said, please only subscribe to what you actually enjoy. It balloons needlessly costs when federation is used outside of genuine interest. It may also pollute the all feed.
I don’t think so. From my understanding that would federate the whole instance with yours and I don’t know if people would want that
It would be straight-forward to script I think (especially if your account is on the same instance). API calls to get a list of all an instance’s communities, then loop through the list, and sub to each one. I guess you’d then want a background version, occasionally checking for something new.
Please do not do this.