While you can certainly have a public Confluence space and have the content in there be indexed by Google, you'll need to know that this is not what Confluence is made for.
Confluence is not SEO optimized and your content will therefore not be very easily findable. If you want to have a public documentation built on Confluence that looks great and is SEO optimized, I'd highly recommend taking a look at something like Scroll Viewport for Confluence.
Take for example this piece of documentation from a public Confluence space. If I google for "custom charts for jira cloud migration" it is only the third result that shows up for me.
We ourselves use Scroll Viewport for the documentation of our apps. If I google for something like "pocketquery cloud ip" I'll get this page as the very first result.
I know this is only one example, so I recommend you try to go ahead and compare this with a few other pages and form your own opinion. Hope this helps! :)
Thanks for the shout out @Sven Schatter _Lively Apps_
You can also check out the pages on help.k15t.com to see how those perform. While we don't have any public pages to compare this to, I hope it's helpful.
This was one of the main use cases we built Scroll Viewport for. Let me know if you'd ever like to see how we use it.
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