I think the name "threads" is the worst you can come up with for an app that will be used world wide. Outside of the U.S. there is a lot which can go wrong in spelling and pronunciation. maybe inside too, idk ;-)
1. threads is very similar to threats (the word threat is much more common)
2. pronunciation of "th" is in a lot of languages a complicated thing, but "thr" is even worse
3. I guess for a lot of people outside the U.S. it is not clear if it is pronounced like in "treat"
4. It is not a very common word my experience
From a company like meta I would expect more thoughtful product naming.