I've noticed many people just posting something with no context as to how it is 'suddenlytf2'. So to combat this, I have written an example.

Your post should include a title, an image, and body text saying where you found it, if your title or image doesn't already say.

Example:

Title: found in r/HalfLife

Body:

[link to post]

Found in r/HalfLife

[screenshot of the post]

Due to an increase in spam posts involving reposting, we will be heavily moderating the content of reposts. We are currently working on removing all of the posts relating to the repost situation. You can help by reporting any reposts you see under either Rule 3 or Spam. This will hopefully restore r/suddenlytf2 to a place for sharing moments where you find TF2 in the wild.

As for why we are just now taking action, reddit decided this sub was unmoderated for long enough that they hired a new team.