The main reason is because it's hard work for the server to calculate for every student and every link whether or not that student is allowed to follow that link (thus making your server slow).
Each participant in a course could have different answers to that question, and it's not nice to show links to things you can't see.
So generally we keep it within one course to keep things simple.
Resource types
linking from moodle web page (resource) to another moodle web page (resource)
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