With any application that connects to a Google “ecosystem” website, there is some probability that Google records, what you can see at the following website:
https://ipleak.net/
And, if using G-mail, or being a Google “ecosystem” user who is signed in to that “ecosystem,” then Google can record a larger amount of information about your content and what you are doing.
If you take the time to learn how to use an Internet browser’s Developer Tools, you may see what traffic occurs between the browser and the webservers. When connecting to many websites that use some kind of Google application, Google feature, Google process . . . you may find in the Developer Tools window (Network, Console tabs), evidence of Google domains:
[*.]firebaseapp.com
[*.]firebaseio.com
[*.]gmail.com
[*.]google.com
[*.]googleapis.com
[*.]googleusercontent.com
[*.]gstatic.com
[*.]youtube.com
“Who knows” what contract relations and obligations exist between a website and Google, that would allow, permit, provide for reports on what traffic has transpired . . . being sent to Google, or from Google to the website?
Regarding only content - such as words that you type in an e-mail message - of an e-mail message that goes to or is sent from a G-mail account, yeah, Google can read the messages - UNLESS you take the time and make the effort to properly encrypt such e-mail messages. You would have to keep up on the latest technical requirements for ensuring such encrypted traffic.
Otherwise, Google probably has a lot of documentation about, what it will say, about what it can or cannot see of your personal content.
Other than Developer Tools, for network monitoring:
Mac OS users - tools: Wireshark and Little Snitch.
Windows OS users - tools: NetLimiter and Security Task Manager.
An encyclopedia of what Brave had done, in order to make Brave Browser more secure:
Brave Browser Development
About Chromium - somewhere online, a few years ago, I found:
“Intrinsically, Chromium is a Google project maintained by many authors (developers, engineers, graphic designers, security researchers … ) from Google, Adobe, Amazon, ARM, Brave, Cloudflare, Facebook, Hewlett-Packard, IBM, Igalia, Intel, Logitech, Microsoft, Mozilla, Nvidia, Opera, Samsung, Vivaldi, Xiaomi, Yandex … and external contributors.”
Chromium is not only a web browser. It is a blend of different important open-source projects:
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Deviations from Chromium (features Brave disables or removes)
Chromium source is fetched
Brave code is fetched
Hooks are run
What Chromium features are removed for privacy/security reasons?
Services & Features We Disable Entirely:
Advanced Privacy - A long list of Brave’s behind-the-scenes protections and commitments.
https://brave.com/privacy-features/
Brave’s advanced protections. Built right into the browser.
https://brave.com/privacy-features/#advanced-expanded-accordion
Brave’s policy, compliance, and research commitments.
https://brave.com/privacy-features/#policies-expanded-accordion