I have noticed this is occuring more and more. It is a problem that started to crop up on reddit but now I’m seeing here more often. Do you not want other people to benefit from the answers you received? This community is kind of pointless if you just get an answer and wipe it from the web.
When you find them, go check the user’s other posts and comments.
I find that often, they have deleted all their content and sometimes even their account. This is especially the case in Reddit where people seem to have gotten enough