I would say, "not as such". It is easy to imagine some support questions ("How do I reset my password?") which are obviously not TeX-related. But a user, especially an inexperienced one, will often have little idea about the source of their problem. They may (wrongly) think they have a TeX problem, when they don't; and they may also wrongly think they have a ...
Apart from the security reason raised by Wang Ki Wun, there are other reasons that Overleaf links should not be accepted as replacements for MWEs. (Some of these you mention in your question, but they bear repeating here.)
First, one of the main goals of the whole network is to be a set of self-contained questions and answers. So in the same way that a link-...
Don't put links to overleaf in public forum, even read-only links will show your email address to everybody
link from this answer https://tex.stackexchange.com/a/506205/195169
click on share and see the mail (I removed name, but you probably recognise that this is your mail)
As a general rule, in case of errors or unexpected output, we should err on the side of more information rather than less. This wouldn't be the first time an editor has caused a compilation error by sending something strange. That's something I often deal with offline with my students as well
I'm Tom and currently I work at the Overleaf Support.
We are actively monitoring the main site for the overleaf tag, so when a question is related to our platform, we shall get notified about it. (And Overleaf is not tagged, feel free tag it and/or to ping me in the chat, I'm often hanging around.)
When the question is an Overleaf bug/imperfection, we try to ...