1-5: True but not dark patterns. Yes they are using the IG user base to bootstrap the threads user base. So what? Was it a dark pattern when google came out with docs and everybody already had an account?
6: Come on, threads asks for permission to send notifications just like every other app, and sends them at a very normal frequency for a social app, in fact if anything a bit less than IG, twitter, etc. Just say no when it asks for permission. Not a dark pattern.
7: Also not a dark pattern. Yes I'm sure the app reported that I liked a picture of a prothonotary warbler to the facebook ad targeting mainframe. Senator, we run ads.
8: As far as I can tell completely wrong. Threads doesn't have access to my location, health data, or financial data?!
9: Right, you can't use threads unless you have threads. Your FOMO is not a dark pattern.
10: False, there is a read-only website. It is very limited but it supports permalinks to threads, and from there you can navigate to user profiles, other threads, etc.
11: Not even wrong, just speculation.