EoL of anything should mean open source code. You don’t want to open source your code? Then you must keep servicing your products and must keep your servers up

BTW, this:

From the side of the Messanger, it could implement stories from pixelfed and communities from Lemmy/mastodon/kbin etc.

I don’t know if anyone is asking for this, but Whatsapp has both, so someone must be using them, right?

As from the side of every other fediverse app, I think it could be a good way of implementing DM functionality without developing and maintaining it for every single app. Maybe. I don’t know really, depends on how it’s developed/implemented