Thanks for that rabbit hole. Interesting. It would make sense for a clever and reasonably tech savvy person at that time to put messages in the HTML thinking it would be sufficiently hidden, and to come up with the strategy to mask business traffic from casual traffic by being an overly popular image host. Then again, people in some sort of intelligence biz that use terminology of secure data storage should also know that obscurity is not not security. If it's a LARP, it is an ambitious one, but people that are armchair military do have a weird mindset of their own.