A 'sweaty' pillow in an unaired apartment will grow mold.
My pillow is usually very wet with sweat in the morning. I even have to turn it over during the night. I sleep under a ceiling fan as I do not us a/c (it affects my breathing - COPD.)
I then air the pillow in the sun the next day. (On my window sill.)
If there is a strong wind, the pillow always falls inside the bedroom.
I have no problem with mold.
Every couple of months or so, I send the pillow to the laundry.
I agree with the OP. The only thing to do with those pillows is to chuck them.
Next time that you go away put your pillows in the laundry and pick them up when you return?