Universal apps run on both Apple Silicon (ARM) processors and Intel processor-based Macs.
If not true, then my original comment seems to still stand.
The only thing that comes close to being "universal apps" would be applications that run in a browser.
* Universal apps (also known as "fat binaries") that run natively on Intel and M1 Macs
* ARM-native Mac apps
* Intel-based Mac apps via Rosetta 2
* iOS/iPadOS apps (developer’s choice)
* Unix/BSD command line apps (Vim, tmux, bash, zsh, etc.)
* Linux via’s built-in hypervisor
* Java
* Electron apps (VS Code, Slack, etc.)
* Windows via virtualization
* Web apps (Service Workers, WASM, push notifications, etc.) on Safari, Chrome, etc.
Safari is already a universal app; I'm sure Chrome, Firefox, etc. will follow shortly.