Possibly, though I wonder how updates would work then. Currently I have a Debian repository that contains a single package, and installing the .deb from my website also installs the repository so you get updates as with any other package.
If someone repackages it on AUR, I guess they will also need to update it every time I update the .deb, so it’s always behind? Of course it would be better if I provided a first party package for AUR, but I can spend time on that when there is actual interest. Most of my users are on Windows anyway.
I know I ran into this years ago. I think it was some collection manager app for a trading card game that someone had on GitHub and only had .deb releases. Eventually you will want to install something niche.
I distribute an app I made for Linux, macOS and Windows. The Linux version I only have available as a .deb. Released recently and has about 200 users so far, but definitely exists. No Arch user contacted me yet.