Bluesky looks to go up then fall back to about half of it's peak. It has the look of a consistently used platform that slowly rolls off users but maintains a solid base. Clubhouse went to the moon then died over a 6 month period. Bluesky would need to drop another 2/3 of it's active users 6 months ago if you wanted your statement to match your data. Bluesky isn't growing exponentially, and is not falling catastrophically. Not a good comparison.