"apt uses dpkg to install the deb file" Apt is a frontend for dpkg which needs a .deb file to install stuff. Apt searches for deb files in repos listed in sources.list, downloads them and then uses dpkg for installation.

My friend, when you install something using the apt package manager you are using a .deb file. It's something getting downloaded in the background from a server (debian.org or the brave one in this case) without you realising it. Make sense?

Ungoogled Chromium, Chromium and Brave are not verified on flathub. I already have regular Chromium, so I can't install the ungoogled fork as they conflict with each other.

I don't like to leave problems unsolved. Secondly, brave comes with default adblocker. What better FOSS chromium alternatives are there?