Our current definition of spam focuses mainly on someone trying to sell you an off-site product.
A post should be marked as spam only if it advertises a product, service, or similar and is unsolicited or lacks disclosure.
Might a user's promotion of their own question raise to the level of spam if after posting a question/answer they start to comment this on other user's post:
This really helped understand the answer to your question: [link to the user's answer].
While the link has nothing to do with the question (e.g. clickbait).
Or maybe an outright comment about their post:
Please, someone, please help me, I need an answer ASAP: [link to the user's question]
Can a user's comments raise to the level of being called "spam" as a description in the flag of "something else" if they're linking to an (on-site) source over and over again?
I would reference: Are links to non-commercial endeavors spam? but this answer seems to be talking about off-site promotion.