My vector illustrations were rejected for “Similar content in our collection.” I checked Adobe Stock and other platforms but couldn’t find similar work. Could someone explain why this happened?

Let’s take an example. If I do a search for Valentines or Valentines Day I get well over 14 million results. Valentine’s hearts nets over 8 million results. The subject in general is thus over-represented. Essentially, even if the asset had been accepted, the likelihood of it showing up on the first few pagers of 100 pages of search results is next to nil. Similar content rejects are most likely being made by a bot that looks at keywords and titles. If it sees too many that resemble other popular keywords in the database, there’s a good chance the assets will be rejected. Frustrating, I know. But it has been this way for a number of months now and there’s not much to be done about it except for using very unique (but still relevant) titles and keywords and hoping for the best.