1) #Harfbuzz is a #text shaping engine, it's used in #Android, #Chrome, #ChromeOS, #Firefox, #GNOME, #GTK+, #KDE, #Qt, #LibreOffice, #OpenJDK, #XeTeX, #PlayStation, #Microsoft #Edge, #Adobe #Photoshop, #Illustrator, #InDesign, #Godot Engine, and other places.
2) Harfbuzz 8.0 introduces a #Wasm shaper, that allows #WebAssembly to be embedded in a #font file. https://www.phoronix.com/news/HarfBuzz-8.0
3) It's only a matter of time until someone embeds a #cryptominer in a font file.