It wasn't killed off. Support was removed from Chrome, for what appears to be rather spurious reasons, but practically everyone else are busy implementing it.
If you haven’t tried ansel: https://ansel.photos/en/ or darktable: https://www.darktable.org/ I’d recommend trying them out - they are the current open source raw editing apps that perform well that are out there. It could be that this app is competitive with them, but I haven’t had a chance to try it out yet - but both ansel and darktable run well on my M1.
While certainly an impressive effort, it's not even close to competitive yet. As is pointed out in a comment on [1] and as can be seen from the rat piss yellow in the sky, the algorithms are very much on the naive/simple side of things.
Excess sugar and simple starches tend to get absorbed more completely than excess fat, I'm not sure added fat is the biggest issue.