Writing the same answer to different questions is not welcome on Stack Exchange sites. The FAQ, then, clearly states:
May I promote products or websites I am affiliated with here?
Be careful, because the community frowns on overt self-promotion and tends to vote it down and flag it as spam. Post good, relevant answers, and if some (but not all) happen to be about your product or website, so be it. However, you must disclose your affiliation in your answers.
If a huge percentage of your posts include a mention of your product or website, you're probably here for the wrong reasons. Our advertising rates are quite reasonable; contact our ad sales team for details. We also offer free community promotion ads for open source projects and non-profit organizations.
While the FAQ is referring to products the OP is affiliated to, I think that repeating the same answer to make a reference to the same product/website is considered promotion.
I would flag those posts, when I see them.