The submitted manuscript apparently was sent to several reviewers. However, no suitable referee could be found within three months. While finding a referee might indeed be a difficult task in some cases, I would have appreciated a note from the editorial office regarding the status of my manuscript after such a long time.
Instead, information was only given after I contacted the editorial team myself. I also never received any answer from the editor himself (who is, in fact, unknown to me up to this date).