Privacy

Here's the actual text of that rule.

No posts promoting cryptocurrency, blockchain or NFTs.

While I do agree that this could perhaps be worded more clearly...

I am 99% sure I have been in threads, on dbzer0, where db0 themself is actually commenting in the same thread, and I've mentioned monero in an actual security context, no problems.

You could ask db0 about this, but my understanding is that the idea here is to prevent cryptoscam bullshit shilling, memecoin pump and dumps, all the scammy bullshit that is 99% of wider internet discourse around crypto.

I'm pretty sure that the scenarios you describe, discussing XMR in the context of actually being a secure and private way to access other privacy and security enhancing stuff.

The active verb in the rule is 'promoting', not 'discussing', as you say.

I do agree this is a bit vague, strictly textually, but I am 99% confident the spirit of the rule is to prevent shilling and the creation of communities based around crypto trading.