I've moved this post to Server Administration , where will probably get more replies.
As for your question,
Maximiliano Luppi wrote:
My question is:
Is only for core-based server licenses?
Or for all Tableau Server installations
This option is only for core-based license.
For more information, Guest User
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Guest access is only available on core license installations of Tableau Server.
It is not available for user-based license installations.
...and Guest is all-or-nothing. You enable it for the entire server, not specific sites. (That's something that I THINK we might change at some point, but not 100% sure)
No way! I forgot that feature landed! LOLZ