As far as curation guidelines there is no mention in there not to promote your own Medium articles. At least for me, it was never a problem to get curated. If you advertise external products or you embed forms, yes that goes against curation guidelines and it won’t get curated.

As for publications, I know that there are a few publications who specifically asks you not to embed articles IN THE TEXT and they might also ask you to remove your articles from the end. But I don’t know about any publication who would reject an article because of this, they would just remove it or ask you to do so.

By the example of this very article:

• I had 3 articles embedded at the bottom and it got curated in Marketing.
• But when I added it to Mind Cafe they removed them with my consent.

So this is kind of a real-life answer to both of your questions. :) Hope it helped.