https://github.com/slint-ui/slint/blob/master/FAQ.md#licensi...
I only mention this because those constraints are notably more restrictive than the vast majority of the Rust crate ecosystem.
I take no particular stance on whether this is a fair or good practice or about the technical suitability of Slint beyond this concern, I just think it's a hurdle for most people so they should be made aware early and often.
Honestly, it’s a bit sad that for some, using libraries for free isn't enough, they also expect to do so without even mentioning the project.
For my use case it was easier to get up and running with a TUI toolkit (ratatui in my case). Plenty of limitations there too alas and I finally landed on Qt…