The VST 3 SDK was recently changed from a dual GPLv3–proprietary license to the MIT license, which made it possible for me to simplify the build process for vst3-rs (the set of Rust bindings that I maintain). I wrote a blog post with some more details: https://micahrj.github.io/posts/vst3/
micahrj.github.io
Simplifying the build process for vst3-rs — Micah Johnston