This is the weirdest part, because you know, coding is solved, so anyone could create their own one, so why not publish it?
And by the way things are done at this company, it's almost a given their whole codebase are litter'd with embarassing shit like hardcoded paths, server secrets, weirdo comments picked up from some random chat context and immortalized through Claude speak, etc. There's no way they'd be able to open source anything.
But all of this is besides the point -- the product was never a source control system (who cares about that anymore?), the product is _the narrative_. It does not matter if everything withers and dies as long as the narrative survives, and by that measure I'd say the goal has been achieved.
You think you have it bad now when GitHub goes down, wait until you're stuck with an online only client.
If I were still manually merging conflicts the p4merge tool was GOAT
I used it in git