I believe this is an act by IMGUR in response to the UK's online safety act - nevertheless it reduces the polish of the game.
I would suggest either hosting these images directly or including them in the games data files directly; rather than using a third party server.
I have looked at the descriptions for all official scenarios. I have not loaded scenarios to look for any images that may appear during the ingame briefing/messages.
Affected scenario descriptions:
- Live - Operation Broken Shield 300
Desert Storm Scenarios 1-15 (Full DLC)