The accusation that Threads is using stolen code is one of the more embarrassing accusation for Musk that he's made. Not as embarrassing for Musk as the fabricated pedophile accusations, but definitely incredibly cringe.
The idea of stealing code for large distributed systems build on entirely different underlying compute architectures just shows how technologically clueless Musk is. Might as well measure productivity by lines of code written. Major pointy-haired boss vibes.
I’ve written against the Facebook Graph API and Twitter’s. Facebook was rock-solid (although they tightened it after Cambridge Analytica to the point it no longer supported my use-case), Twitter couldn’t go two weeks without a failure or regression of some sort. Gave me strong contempt for Twitter’s engineering culture and I suspect Meta would know this as well. As a former CTO and hiring manager, I’d certainly consider a stint at Twitter on a candidate’s resume as a black mark.