It seems like it would be so low effort to bypass, especially when you can just train a system (maybe even another LLM) using the watermarker validation from Anthropic themselves.

It seems it would get as simple as:

  outputText = promptLLM(prompt)
  scrubbedText = scrubWatermark(outputText)

Might help with students and low-technical people passing off work as their own, but any industrial scale slop-generator should be able to bypass it trivially.