Forum Changes - Why I Hate Them

[Jessail-terenas (Jessail)]

@Talbyy-tichondrius

but you should be ok if it’s from trusted sites like imgur.

It seems the exact rules are thus:

@Siyanati-dalaran

As mentioned before, Trust Level 1 and 2 users can post select links and embedded content from trustworthy sources such as YouTube or Twitch. At Trust Level 3, you have access to posting links and content from any domain of the world wide web. To post an image or a video embed of a YouTube Video or a Twitch Clip, Video or Stream. Simply copy the shareable URL of that content in its own line of text. Note that image content that is too large in file size may be prevented from displaying in the page (it used to be 3 MB but I know they have increased it from that).

I suspect even within that it has to be a blizzard account, not just random accounts.