@mwest688,
There are many ways we do this, but I’d like to mention one thing first:
It’s important to remember that extensions have elevated access/privileges (by nature, it’s this way in other browsers as well. Brave will always protect you from anything malicious, but as far as installing any third party extension (in Muon as well), users are subject to the policy of that party.
Make sure you read the permissions each extension/app requires before installing it on your system. We don’t want to restrict users from being able to use extensions but we also want to make it clear that if you decide to use them you should ensure that it’s an extension/company you trust.
For the answer to your actual question, some reading for you:
https://community.brave.com/t/brave-chromium-google-and-your-data/34395?u=mattches
https://community.brave.com/t/how-much-google-is-removed-from-brave-beta/33830/4?u=mattches
Hope this helps. Please let me know if you have any further questions.