AI content's paper trail arrives: a guitar brand caught out, Claude watermarks, and Twitch training by default

Three unrelated stories landed on the same question this week: can anyone tell where a piece of content came from, and did its maker agree to it? D'Addario finally admitted that a promotional video used Suno-generated music after two weeks of denials; Anthropic shipped watermarking that some Claude users are angry about precisely because it works; and Twitch turned on training-by-default with a chief product officer saying out loud that opt-in would have gotten nobody. Elsewhere the big platforms are pruning rather than launching — Microsoft is merging its Copilot apps and killing several features — while Google's AI reorganisation has the industry asking whether it still wants to win.

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