I just logged in on the iOS app and it immediately had a popup giving me the option to opt-out.
So yeah, annoying, but they handled it well.
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Sure, I understand the concerns many if you have.
But in my niche areas of cognitive research, genetics, and neurophilosophy I need Claude to be much smarter than it is now. I am happy to share what I know with Anthropic so that zi eventually have a better companion thinker.