On my way to familiarize myself with flagging I sometimes have to risk a decline to explore the limits.
On that occasion, I stumbled over a border where I would like to ask for clarification.
We use the spam flag, among other things, for excessive advertising (I know that strictly speaking, this is not entirely correct).
My question does not refer to "spam" from known spammers, (eg. from The Master Spam List provided by bwDraco) without disclosure, links insidiously hidden in text or punctuation marks or spam in the real sense, so not referring to the question.
May I promote products I am affiliated with here?
The community generally frowns on overt self-promotion and tends to vote it down and flag it as spam, so be careful. Post good, relevant answers, and if they happen to be about your product, so be it. However, you must disclose your affiliation with the product in your answers. Also, if a huge percentage of your posts include a mention of your product, you're clearly here for the wrong reasons. Our advertising rates are quite reasonable; contact our ad sales team for details. We also offer free vote-based advertising for open source projects.
which differs from:
How to not be a spammer
The community here tends to vote down overt self-promotion and flag it as spam. Post good, relevant answers, and if some (but not all) happen to be about your product or website, that’s okay. However, you must disclose your affiliation in your answers.
Disclose your affiliation therefore seems to be a protective shield that could also be used by known spammers too (while I have to admit that I'd have expected this implicit if someone is spamming.)
Following the last one, my question is:
Would it be enough for known spam
(of that sort spamming the whole web, which usually gets immediately nuked, including the user, even if targeting the question and including some text as answer, so maybe relevant)
, to including a disclosure and having answered one question without promotional content, to be able to answer many questions mentioning the product or linking to the product?
If yes, what protects stack exchange from being flooded with those, even competing on a single question?
If not, what distinguishes a "known spammer" from an (I call it) unknown spammer, with e.g. 10 answers on stack exchange sites with only one answer not promoting his product?