@ian_macf
So, in spite of the unified membership system, my account at SciFiStories can get cancelled while my account at SOL and my account at FineStories remain valid ?
Unified membership refers to premier level. If you have premier level membership, you shouldn't get those notifications.
If that happens, are there any problems getting a new account for SciFiStories using my same email again ?
The log in record has been unified for few years now and practically never deleted. When you click a link to another site from SOL, to Finestories for example, the local database entry is recreated on finestories if it's missing. You won't see anything amiss.
What gets deleted after such a notice is data like followed authors list. So if you go back to finestories after your local account on finestories gets deleted, you won't find any data (preferences, followed authors, etc...) but you will be able to log in as if nothing changed.