`apt install chromium-browser` installs Chromium as a snap package. If you don't have snapd installed, it'll "helpfully" install it for you.
It's become a binary choice between snap and flatpak, with flatpak being preferred by all major Ubuntu forks (Pop OS, elementary OS, Linux Mint). I won't be shocked if years from now Ubuntu decides snap is no longer worth it, like they did with Mir and Unity.
Alternatively, the *ubuntus have Snap pre-installed and recently said they are removing Flatpak support, although I believe the user can install Flatpak if they want to use flatpaks.
Uninstalling snap removed every web browser available short of lynx and w3m. That was fun. Trying to add one back also adds snap back. Next install I'm ditching Ubuntu.
If you can avoid all that by using Pop or Mint, why not?