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The pitch for browser copilots is irresistible: summarize this tab, draft that email, fill those forms. But in the post-cookie scramble, “helpfulness” is fast becoming the pretext for total session capture—keystrokes, tabs, docs, even scroll heatmaps. We’ve been here before. This time, the telemetry is closer to the metal.
From helpfulness to full-session capture
Copilots work best when they see everything. That reality nudges vendors toward keylogging, page context scraping, and cloud inference that hoovers up more than the task demands. It’s the old surveillance playbook in a shiny wrapper, and it puts founders and CIOs on the hook for a bigger breach surface, thornier compliance, and costly vendor risk.
Browser copilots = post-cookie surveillance
If you’re fiscally conservative, this isn’t just a privacy rant—it’s a balance-sheet risk. Storing sensitive context you don’t need is a liability with compounding interest: regulatory fines, discovery exposure, incident response spend, reputational damage, and opportunity cost while your team fights fires. The cheapest, safest data is the data you never collect.
Trust is the moat, not model size
Bigger models won’t save you; verifiable trust will. Make surveillance technically impossible: on-device inference as the default, ephemeral context windows, a local data vault with user-controlled retention, and zero-knowledge design so the provider can’t access plaintext—even if they want to. Ship guardrails like per-site scopes, purpose binding, and explicit user intent prompts for cross-tab access.
A practical architecture founders can ship
- Local-first: run a capable small model in the browser/app; escalate to cloud only when needed and only with minimal, encrypted snippets.
- Local data vault: searchable embeddings stored on-device; opt-in sync with client-held keys; automatic TTLs and wipe-on-logout.
- No session replay: disable keystroke capture by default; never record PII fields; enforce content-type allowlists.
- Verifiable builds: signed binaries, reproducible builds, and a public privacy manifest enumerating exactly what is collected, where it lives, and for how long.
- Observability without voyeurism: aggregate, differentially private metrics instead of raw event logs.
Procurement checklist for CIOs and buyers
Ask vendors to prove, not promise:
- Does it run fully on-device? What percent of requests are served locally today?
- Is any user data used to train models? Can we turn that off contractually?
- Data retention and locality: exact TTLs, region pinning, and deletion SLAs.
- Session replay or keystroke logging anywhere in the product or SDKs?
- Third-party trackers embedded? Names, purposes, and opt-out.
- Privacy pen-tests and red-team results focused on data exfiltration.
- SOC 2/ISO status, incident history, and breach notification timelines.
Metrics that actually matter
Treat privacy like performance. Track local-serve rate, average payload size for cloud escalations, time-to-delete, consent conversion, and “privacy MTTR” for misconfigurations. Many teams are surprised to learn that local-first copilots are not just safer; they’re faster and cheaper once you factor egress, inference costs, and legal overhead.
The upside: faster, cheaper, safer
The market will reward products that are useful without being nosy. If you’re building, ship a local-first mode in 90 days and publish a privacy manifest your CFO can read. If you’re buying, make “verifiable trust” the RFP headline. The next platform winner won’t be whoever logs the most—it’ll be whoever needs the least.
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