The main problem with favicon meta is that it can be used to track users across different websites. This can be problematic because it allows websites to track users without their consent.
tag <link rel="shortcut icon" href="favicon.ico" type="image/x-icon">
The code line is linking the HTML document to a shortcut icon file. The shortcut icon file is used to display an icon for the website when it is added to a browser’s favorites or bookmarks.
What is a favicon
A favicon is a small icon that appears in the address bar of a web browser when you are viewing a web page. Favicons are often used to represent a website or application on a user’s desktop.
A metatag is a tag that tells a search engine what to look for when indexing a document. A metatag can be used to include keywords in the document’s title, description, or other text.