The End of my Exposed Host Experiment
For months I have been hosting Immich, Photoprism and AudioBookShelf and the experiment has been a success. It has been stable and reliable so far and I did not detect anyone accessing my server without permission.
I had these services as Exposed Host via the Swisscom router DMZ setting. it was easy to setup and run with no issues for the duration of the experiment. I closed the DMZ because no one but me was accessing these services after five to six months but me.