-1 points
Twitter used to be bigger than it is now and it also used to have less spam. So clearly size isn’t the problem.
Twitter usage surged significantly prior to the Musk buyout. In 2010 they had 40M. They crested 400M users by 2020.
That’s the difference between growing your base and harvesting them.
Bluesky has in the neighborhood of 5-6M, by comparison.