While the very same software might be in a PPA and a snap, the fact that the snap is shown in Ubuntu Software is the point I’m making. Many people use that to install software. So making software appear there is beneficial for developers - their software is found, and beneficial for users - they discover new software.

In addition, PPAs are awful for software discovery. Average users have no idea what a PPA is, nor how to configure or install software from it. Part of the point of snap is to make software discovery easier. We can put new software in the “Editor’s Picks” in Ubuntu Software then people will discover and install it. Having software in a random PPA somewhere online is only usable by experts. Normal users have no visibility to it.