If you're talking about the artcraft stuff, it's strange. The codebase goes back to 2016 as a monorepo but not the full suite and was recently split out as separate apps and other parts of the Adobe suite added. The CLAUDE.md [1] are... interesting and left me puzzling about it.
I was mostly interested in the pdfcraft (have been appreciating https://www.nobloatpdf.com/)
> Clean-room.
> * Never read, disassemble or copy anything inside the Acrobat bundle (names and listings only). Never open Contents/Resources/JavaScripts/.
> * Behaviour comes from public docs, specs (ISO 32000-2, the Arlington model) and black-box observation (plan/acrobat/).
> * Never copy GPL/AGPL code. MuPDF, Ghostscript, Poppler, veraPDF and DSS run only as external oracle processes.
> * See plan/README.md §Clean-room and plan/adr/0001.
It really looks like they have AI running Adobe (and other apps) as sources of truth and have rules against disassembly or including source from GPL projects which left me pondering the ethics of it.
[1] https://github.com/storytold/pdfcraft/blob/main/CLAUDE.md