Between April 20 and April 29, Chrome quietly downloaded a 4GB AI model onto your computer.
It's called Gemini Nano. You didn't agree to it. You weren't notified. And if you delete it, Chrome downloads it again.
Snopes confirmed it. A privacy researcher forensically documented it. Google has admitted that the model exists and states it has been shipping since 2024.
Here's the part that should bother you: the "AI Mode" button you actually see in Chrome doesn't even use this local model. That button sends your searches to Google's servers. The 4GB sitting on your machine powers features buried in menus you've probably never opened.
You don't have to wait for a regulator to act. Here are 7 moves to take your data back tonight.
Why most people get this wrong:
They assume "on-device AI" means private.
It sounds private. The model is on your machine, so surely your data stays there. But the model being local doesn't mean the company stops collecting. It means a 4GB file you didn't ask for is sitting on your drive, updating itself, while the visible AI features still route your queries to the cloud.
The fix isn't trusting the toggle. It's cutting the data off at every layer. Browser, search, account, email, messages, and apps.
Here are the 7 moves. Each one takes a few minutes.
1/ Switch Your Browser
Chrome ships with Google's AI baked in. The cleanest fix is to stop using it.
Switch to Brave for everyday browsing. It blocks trackers by default and runs on the same engine, so every site still works. For serious anonymity, use the Tor Browser.
Same web. No Google AI is watching what you do. No 4GB model is reinstalling itself on your drive.
2/ Kill Chrome's AI (if you're staying)
Not ready to leave Chrome? Turn the model off and take the space back.
Type chrome://flags in the address bar. Search "optimization guide on device." Set it to Disabled. Restart Chrome.
Then delete the model itself. It lives in your Chrome user data folder in a folder called OptGuideOnDeviceModel. Delete that folder to free the 4GB.
Google added a setting in February 2026 that's supposed to stop it re-downloading once disabled. Disable the flag first, then delete, and check back in a week to confirm it stayed gone.
3/ Replace Google Search
Every Google search feeds your profile.
Change your default search engine to DuckDuckGo. It doesn't log what you search, buy, or worry about at 2am.
You get the same answers most of the time, with none of the tracking behind them.
4/ Lock Your Google Account
Still on Gmail or Drive? Cut off what they track at the source.
Go to myactivity.google.com. Turn off Web & App Activity, Location History, and YouTube History. Then delete what's already saved.
That stops new activity from feeding their profile of you and clears the backlog.
5/ Get A Private Email
For anything sensitive, stop using Gmail.
Get a free ProtonMail address. It's end-to-end encrypted by default, so the contents of your inbox can't be read on their side.
Use it for medical, legal, and financial mail. Keep Gmail for newsletters and junk if you want, but move the private stuff off it.
6/ Encrypt Your Messages
Regular texts and most chat apps can be read in transit.
Install Signal and use it for anything sensitive. End-to-end encrypted, free, no ads, no logs.
It only works if both sides have it, so tell the people who matter to install it too.
7/ Kill App Tracking (the most important one)
One toggle stops dozens of apps from profiling you in the background.
iPhone: Settings, Privacy & Security, Tracking, then turn off "Allow Apps to Request to Track."
Android: Settings, Privacy, Ads, then reset your advertising ID and turn on "Limit ad tracking."
This single switch cuts off the cross-app data sharing that builds your advertising profile.
Setup (20 minutes tonight):
Steps 1 through 3 are browser and search. Do them in one sitting.
Step 4 is your Google account. 5 minutes.
Steps 5 and 6 are two free app installs.
Step 7 is one toggle on your phone.
Twenty minutes total. Then your data stops feeding systems you never agreed to feed.
The compound effect:
Tonight: The 4GB model is gone. Your searches, email, and messages stop feeding profiles.
Week 1: You notice how much quieter the internet feels when you're not being tracked across every site.
Month 1: You realize "free" products were charging you in data the whole time, and you stopped paying.
Year 1: When the next silent install happens, and it will, you're already off the platforms that do it.
That's the shift.
Most people find out about things like this from a headline months later. You're acting on it the week it broke.
Do this tonight. 20 minutes. That's it.
While everyone else waits for a hearing that may never change anything, you'll have already taken your data back.
Cheers,
Matas Jonaitis
Founder, DailyChatGPT (@dailyprompter)