I think it's highly dependent on the user. A technically inclined HN user probably knows people who shifted to a tech Mastodon instance (like infosec.exchange).
As a personal anecdote, the people I know who cut back on Twitter did so long before Musk due to general social media burnout.
Quite a lot of my feed was Popehat, Tqbf, and Mjg59, who have all left the platform (more or less). Also a handful of low volume, personal friends went to Mastodon or retired from the platform.
I don't have an active twitter account, so one of the things I like from post-Musk Twitter is that it no longer requires me to login for reading tweets or for searching.
Same, site's actually way, way better now for us non-account-havers.
And the dumb shit Elon posts and all the times he kicks himself in the balls are way funnier than before he acquired 'em.
Overall, I'm happier with the site since he took over, personally. But then I'm rooting for its demise, preferably with as much drama and humor along the way as possible, so of course I like it.