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True @mackuba. I believe recent versions of the vanilla Mastodon apps have some kind of What's Hot timeline. That's a serendipity generator, which is what most people mean when they say "social media algorithm", " AI", or sometimes "recommendation engine".
I don't see anything but my notifications, and occasional dips into the firehose. If the third-party Android and web apps I use have any of the other timelines, I never see them. But they're there if people want "algorithms".