I really doubt that 400M number. They try to get me to login to Threads see comments on Instagram posts. Technically I am monthly "active" user, but not really.
I see more Bluesky links in the wild than Threads and they claim only 27M users.
Threads is taking off in regions likely irrelevant to your interests (India, Taiwan, Japan, Brazil, etc). The content on Threads covers national politics and local social issues, which would typically not be shared on a tech forum like this one.
Tech news is still dominated by X and bluesky, so naturally those content sources appear more here.
Threads is an internally developed Twitter clone when Twitter launched in 2006 and Threads launched in 2023? I'm not saying they didn't build it, but it was not an original product design; they waited until there was already a market, launched and deployed it to Facebook users. I will give you the Ray-Ban glasses, but even that was a product that is a better version of Google Glass, so still not really a unique product.
The creep factor of AI glasses is high. That was a contributing factor to the failure of Google Glass, and I’ve seen various reports of places moving to ban the Meta glass. People, in general, are not comfortable with a camera pointed at them. People walking around with cameras on their face that may or may not be recording is not something the average person wants as a common thing.
I see more Bluesky links in the wild than Threads and they claim only 27M users.