Could Zazzle automatically detect where a near identical greeting card (or other product) has been added tens or hundreds of times in the marketplace targeting every conceivable combination of age and family relation?
Then add a “variants” button either to the marketplace entry or the product page, which a customer can click on to see the variants, making it a choice to browse through the tens or hundreds of combinations, rather than those combinations flooding the marketplace for everybody?
Just to add, an interim or complementary measure (and less technical) might be to add a fifth category to the “report this design” feature: “Product Spamming”.
A set of search results that serve up the same design tens or hundreds of times doesn’t help the customer, other creators or Zazzle, so is surely a reasonable grounds to report?