The reality is like that xkcd meme of some random dev in midwest US supporting critical infra with their open source efforts. GitHub natively runs Mermaid which runs Dagre, which has been unmaintained for many years now because the one guy working on it left and nobody's touched it since, despite many holes in the algorithm.

ELK has been continuously worked on by a research team for over a decade, and we can produce better looking layouts just by specializing for different cases. The space is so large. I hope that a great FOSS open-source layout engine comes along, I'll gladly integrate it into D2, but I don't fear it'll make TALA moot.