If I got an OoO just to tell me to have a good day, I would find that person and throw water on their computer. They’re obviously not qualified to operate one.
My husband does this with his phone (not a number he uses for work). My parents do this as well and I can’t figure out if it’s due to lack of tech skills or not wanting to deal with voicemails (I think it’s a combination). I had surgery a couple years ago and had to give the hospital all three numbers and then my brother an hour away as backup since he’s the only one besides me with functional voicemail.

My colleague does that just for holidays.. it does say who else to contact, but tbh if I’m emailing him a couple of days before he’s due to return then I’m not massively impressed at the insinuation I should take the action of remembering to resend it… in reality I think he probably does read *some* emails but clearly views the OOO as a way to absolve responsibility if he misses something..
I wrote the above comment off the top of my head. I wish I had time to rewrite and edit it. I would have changed “their goldfish” to “a spider they accidentally stepped on”, and would have added more detail to the story of the sister’s death (e.g. “her Pomeranian yapping” rather than the less descriptive “her dog barking”). Unfortunately, I could not do the thorough writing job required for that comment because someone close to me recently … – The person whose out of office advertised his gig on the weekend, for anyone in travelling to [city] – The people in a certain department who have taken to saying things like “if you really need to contact me, call 000-YYY-XXXX where Y is the square root of [insert numbers] and X is the year plutonium was discovered.” – The ones where people have an auto response saying they only check their emails once a day between 1-2pm – “I’m on research leave and I may be slow to reply.” (Whereby it is guaranteed they will reply immediately, because academics do not *really* take breaks).