I use different AI tools for different contexts. One for work drafts. A different one for casual thinking late at night. Another for shopping decisions.

Last month, one of them suggested a note-taking structure I had only ever described to a different app, in a completely separate conversation. Not a generic suggestion. The specific way I organize unfinished thoughts.

I've been turning this over since.

The instinct is to assume some data leak, some API handshake, some terms-of-service clause I skimmed past. But the more uncomfortable explanation is simpler: no data needed to be shared directly.
Behavioral signals are readable patterns. The rhythm of how you phrase uncertainty, the timing of what you search for versus what you ask aloud, these patterns are legible to intermediaries sitting between apps who never directly hold your data.

The fragmentation is almost the point.

When no single platform holds the full picture, it feels private. But a composite can exist downstream, assembled from fragments that each looked harmless alone. The illusion of separation is doing work that actual separation should be doing.

Which raises the question most privacy conversations quietly avoid: who sits at that infrastructure layer, and what incentives do they carry?

I've been following OpenGradient for this reason. Their architecture is built to address the accumulation problem at that layer, before it reaches the applications people actually see.

Have you ever felt like two completely separate AI tools somehow knew the same thing about you, and couldn't explain how?

@OpenGradient
$OPG
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