Word of the Tub Gods: like Twitter, Mastodon sets your posting default to Public. If you only want your toots visible to other people on the instance, go to Preferences > Other, and under Posting Defaults set Posting Privacy to "Unlisted".

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Well, not exactly. Turns out they're unlisted in public timelines, but still available by URL. See docs.joinmastodon.org/user/pos

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