There is of course a gray zone, but I wonder a bit what the policy is on this type of posts, as some of these might be a type of self-promoting hidden as a question.
In a private discussion, a point was made that for amateur/young mathematicians that do not yet have a large network of colleauges to send
(stuff down their throat) preprints to, this type of posts could actually be helpful (the only way?) to get some hints on rough drafts.
Perhaps some new tags, self-promotion and feedback-request would be in order, if such questions are not discouraged.
This website is perhaps the most friendly (and only) way for non-professional mathematicans to interact with a large group of mathematicians.