A lot of people dislike it for the privacy nightmare that it is and the threat of an EEE attack. This will probably not be the last time that a big corporation will insert itself in the Fediverse.
People also say that it will help get ActivityPub and the Fediverse go more mainstream and say that corporations don’t have that much influence on the Fediverse since people are in control of their own servers.
What a lot of posts have in common is that they want some kind of action to be taken, whether it’d be mass defederating from Threads, or accept them in some way that does not harm the Fediverse as much.
What actions can we take to deal with Threads?
Half a billion Twitter users? At its peak Twitter had 300 million monthly users. Or are you talking total number of Twitter accounts, even the ones that have been lying dormant since 2016?
Twitter has always been an also-ran as a social media site. Despite being a “major” and “international” site, its peak user count was smaller than a lot of strictly-regional social media sites. Sina Weibo, for example, was until recently regarded as a failure because it had “only” 600 million active users, and that’s a single-nation site for all practical purposes, against Twitter’s “international” membership. (With a major cash and marketing push from new owners Ali, Weibo has grown quite a bit since those failure days, mind. It still has only about 600 million active users, but it’s become quite an influential social hub at the expense of Tencent’s QZone.)