Private Message (PM) was common until Twitter and Instagram came around, where the platforms did not want to get in trouble for implying that your messages were "Private" in any way, so the renamed them "Direct Messages". Reddit and Lemmy make user-to-user messages easily accessible by admins, so DM is appropriate here.
I never understood why people want boob pics to their inbox. Just go on a boob pic community, it's going to be the same people sending them that post them freely.
Back on R*ddit (with the same username), I actually got a PM of someone's guitar cabinet speakers. None of them were Vintage 30s, but some other guitar speakers that they mounted in their speaker cabinet. It was very much appreciated.
Although I prefer Vintage 30s, I strongly encourage any and/or all of you to PM me any guitar speakers you have. But, I still live in hope that someday, someone might PM me Vintage 30s...