@Lee_Holmes @scottjenson I have a series of anecdotes, not necessarily data. I’ve been told peoples’ reasons for leaving include:
Being harassed (one particularly high profile infosec person loved to cook and post pictures of her cooking, and she left because of relentless
harassment by people insisting she CW her food pics)
Lack of reach - just like most people are temporarily inconvenienced billionaires, many tech people are in it for the audience and the associated benefits, even if it’s unlikely they will ever achieve that level of fame
Discoverability - this has gotten much better, but search was largely nonexistent here when many people bailed and went to bsky.
Plain ole network effect - that’s where people and organizations they want to follow landed
Longevity - I’ve known many people that started out on instances that were later shut down, and many people impacted by that just don’t come back.