The ‘Elden Ring Inappropriate Activity Detected’ error signifies that an exploit, which is strictly not allowed, is being used. However, this is not entirely accurate since the error can also arise due to corruption or a bug in the Elden Ring files. This fact is confirmed via Elden Ring’s official Twitter account.

In the official tweet, they apologized for the inconvenience and suggested a solution to verify the game files in order to fix this error.
If you receive the message “Inappropriate Activity Detected” while loading the #PC version of #ELDENRING , please verify that the game files have been installed properly. https://t.co/eBE8HEnXSj We apologize for the inconvenience and thank you for your patience. — ELDEN RING (@ELDENRING) June 14, 2022