Means you haven’t gotten any visitors, or logged-in in awhile.
This is a free service, how much more do you expect? It is not free to send emails on a large scale you know…
Have you ever head of creating a backup? You should ALWAYS have a backup on your own machine (And an external drive at a friends house or in a safe), as hardware can fail, and data can be corrupted (This can happen on all hosts, not just free ones).
Unfortunately, your files may have disappeared due to this: