Most of these are solved problems to one degree or another. Web browsers have generally switched over to decoding legacy unsafe formats like PDF using safe managed languages, typically JavaScript.

> JBIG2 and CCITT Fax

Since performance isn't such a critical concern with obscure legacy formats, it really wouldn't be much more than a day or two of work for a competent developer with AI agent tooling to convert an existing decoder to safe Rust.

Meta set nearly a hundred billion dollars on fire for a total failure that everybody saw coming, a trillion dollars is what the current AI investment crazy is pouring into concrete and TSMC chips, but... a couple of days for a developer is asking too much!?