Twitter is a public app. How hard it’s to keep the app open on one monitor and write a spec doc on another?
Is an artist with references open in another pane breaking copyright?
If we stoop to the rounded-corners Apple level then there's not really much point anyone making anything new anymore.
It seems kind of ludicrous that one company can't look at another's product and create the same type of thing, just improved. That's how innovation works.
It's just that in this case, apart from a handful of differences, the core innovation of threads seems to be that Twitter has been taken over by an egotistical maniac and while Zuck is still a billionaire he seems wholly less concerned with tooting his own horn in public as Elon is.
I don't think Elon/Twitter has a leg to stand on, they don't own the concept of a public forum/social media platform, I'm sure that even the shortform that Twitter has enforced since its inception had been done long before.
Twitter's idea came from Text messages
That's not all that surprising though, Meta could obviously build such a product from their own learnings and IP.