Not setting up an account, that’s roughly the same. Adding contacts by topic, blocking topics and people with bad agendas en masse, etc. I started my Mastodon account almost a year before Bluesky. In Bluesky I had something useful in a week. In Mastodon I still don’t (and it’s not for lack of effort).
For me it’s the difference between something that’s usable for its purpose and something that’s not. As much as I wanted to use Mastodon and tried, it just never got off the ground. If Mastodon introduced starter packs, subscribable block lists, topic tagging and blocks, etc. I would use it in the same way I do Bluesky. But it hasn’t done that so I don’t.