That’s totally valid. In the end, all apps on Apple platforms exist at the liberty of Apple. I have several friends who’ve seen their app stop working on Tahoe or previous macOS due to subtle changes in the SDK or the OS.

I think Backdrop fills a specific need that Apple does not want to cover, much like other utility apps like Bartender etc. It will likely require continuous updates, but I’m not new to that, having supported my Trim Enabler utility all the way from OS X Leopard to current macOS.