If you remove the built-in "Ubuntu Software" from Ubuntu 20.04 (which is actually the "Snap Store") and then later re-install it, you will find that all Ubuntu branding is missing, and it now shows up as "Snap Store" (instead of "Ubuntu Software").
The command to install the Snap Store is this:
snap install snap-store
The command to download the Ubuntu-branded version is this:
snap refresh snap-store --channel=latest/stable/ubuntu-20.04