In contrast to search engines, web catalogs are editorially maintained directories. The editors search the web for sites that correspond to the different requirements of the operator, so they can be included in the respective web catalog.
This means people are at work here, who invest time and money to fill a product, their web catalog, with content. This content represents an added value for the users, and in return can enhance the own directory through content-rich websites. Many web catalogs offer the possibility to enter a website here under different conditions.
A requirement that should always be met for the site to be listed is an adaptation to the current technical standard. Another important aspect is the website description: it must be unique to allow the website to be included in the catalog. Copied and used texts are mostly recognized and lead to the rejection of the website.
Especially in the case of web catalogs, which are well-known and can be a good advertising platform for your own offer, such a rejection is quite annoying.