DevForums has the concept of public and private tags:
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Public tags are available to everyone, per the rules outlined in Developer > Support > Developer Forums.
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Private tags are limited to a specific set of developers.
The canonical example of a private tag is Universal App Quick Start, which is only available to folks who had an Apple silicon DTK.
If you have access to any private tags, the New Post form has an extra field, Post Visibility. Its default value is Private but you can switch it to Public. The Tags field adjusts accordingly. So, if you select Private you only see a limited set of private tags. Use these if your post is about one of those private topics. OTOH, if your post is about a public topic, change Post Visibility to Public and apply the appropriate public tags.
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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"