Some of them did, but that's a very small number of users, out of the millions of accounts that we're talking about overall. Although nobody keeps accurate statistics on Steem any more, as best I can determine it has about half the active users and posts per day as Hive. However, it still has one thing going for it, it ranks much better on search engines and get far, far more organic traffic than any Hive website due to the heights it reached in 2017/2018. Those users don't actually interact with Steem though beyond landing on the page and then moving on with their lives.
RE: Where are all the Dormant Hive Users?