Magento 2 - Remove Category Image on top of Category Page

Take a look these files:

- The layout

vendor/magento/module-catalog/view/frontend/layout/catalog_category_view.xml

- Template

vendor/magento/module-catalog/view/frontend/templates/category/image.phtml

You can remove the image via layout in your custom theme. For example, in your custom theme:

app/design/frontend/Vendor/Theme/Magento_Catalog/layout/catalog_category_view.xml

<?xml version="1.0"?>

<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" layout="2columns-left" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
    <body>
        <referenceBlock name="category.image" remove="true"/>
    </body>
</page>