The good news is: this kind of attack hasn't happened yet, and simple word filters remain the most effective way to block spam on Nostr. Maybe spammers will get smarter someday—but if they do, we'll adapt accordingly. For now, they’re embarrassingly unsophisticated. A basic word filter is more than enough, and regular users don’t need to waste time on complex solutions.
If you're interested in building smarter defenses, go ahead. But claiming that “simple filters don’t work because spammers *might* get clever eventually” is nonsense. They *do* work, and they’re the easiest method available for users to eliminate spam. If spammers were truly smart, they wouldn’t be wasting their time and money just to mildly annoy strangers while gaining absolutely nothing from it.