All, this is real. There are lawyers out there with international reach who make their living enforcing image copyrights. I had one such encounter. Thankfully, I prevailed, but it could have been much worse.
To avoid such problems, be very careful what images you take and use from the Internet, and how you use them. Browsers such as Chrome have image screening tools that can show you freely available and licensable images (public domain, creative commons, etc.). Do your homework on legal image reuse and protect yourself.
I now use my own imagery whenever possible. Good luck, and Happy Orienteering!
Don Watenpaugh
https://www.studiovidenda.com/data-art#/orienteering-olympics/