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If it's that simple and obvious, you'll have 10 "Remove Claude Watermark" web-apps by the end of Day 1. Most of them coded by Claude.

Hell, it'll probably happen no matter how sophisticated their watermark is. There's no watermark in text that can't be detected and removed, and no text that can't be converted to generic keyboard ASCII.

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You forgot about the cases where (1) people don't care, (2) people want to say "I used an LLM for this". I'm convinced that those cases happen more often than you think. Why not cover them with a simple mechanism? It's also in the interest of AI companies who don't want to train on AI output.
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Depends on the pushback in different sets of users. Students for example would clean it up.
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Sure, but let's first find out how many % of people are willing to be frank about their AI usage, and/or don't care about it. My guess is it is worthwhile to do this.
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But the source codes of those web apps will also be watermarked. /s
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Those invisible spaces get wiped by the first sanitizer in any normal ide. Worse it'll instantly break parsing for configs like yaml where spaces are critical for structure
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https://unicode-explorer.com/articles/space-characters

U+2800 or U+3164 would be nice.

But as I remove unwanted characters with grep before layout in InDesign, someone will make a skill for removing such space characters.

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We already have one, our Claude setup already requires output to be 7-bit ASCII clean and scans it for such.
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