Meta’s new text-based social app Threads has quickly gained 100 million users since launching last week, which appears to be negatively impacting traffic on Twitter. According to web analytics, Twitter traffic declined 5-11% over the first two days Threads was available compared to the previous week. Threads was able to grow rapidly by allowing users to sign up with their existing Instagram accounts and bring over some of their followers. However, Threads has not yet launched in Europe due to regulatory issues. The fast growth of Threads may solidify its position as a real competitor to Twitter, which has over 238 million daily active users.
Your first point is an “initial limitation”.
Your second point:" This is presumably due to most fediverse services not yet supporting reply restrictions."
Not sure why you are using select quotes without giving the full context to make a point that is actually not there.