It would be nice if Moodle can send an internal message and/or email for the user who created a discussion that is moved to another forum.
Something like this would be useful:
"Hello,
{creator user}a discussion you created was moved to a more appropriate forum:
{forum name}https://moodle.org/mod/forum/view.php?id=000
The URL for the discussion is still the same:
https://moodle.org/mod/forum/discuss.php?d=0000
Kind regards,
{user who moved the discussion}"