Hello,
The meta robots tag is often used to stop robots from indexing a page, by using the “noindex” tag.
If you don’t have any meta robots tag on your pages, by default all search engine bots will crawl and index them, so it would be redundant to add a “index” meta robots tag to your pages and this is the reason why it’s not added.
You can read more about this here: https://yoast.com/robots-meta-tags/
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Thanks for understanding!