The default used to auto-subscribe new users to all subs. But the subs were chaos without management. Worse, new subs are being created all the time and people were/are not aware of them, much less not auto-subscribed to them. I don't know if they consulted the community when they picked their preferred list, or consulted the community when they decided to implement it. I understood their decision but was never for it.

Many times I've considered doing regular announcements covering the latest subs. They wouldn't need to be by any schedule, as long as subs weren't unfairly omitted. There are many other things like this that might be good for SaidIt as a community. Many of them could be auto-generated too, with a coder or few.