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I think you bring up a good point about college and high school classmates. I don’t personally care about this but I imagine millions of others do. IMO, these groups should maintain their own social platforms. If you want to keep in touch with your classmates from Harvard, Harvard (or a private student counsel board) should maintain a forum for you.
Right - you want to post a picture of your kid for family, classmates, friends, coworkers to see all at once. Well, that’s (supposedly) where the fediverse comes in.
The fediverse, of what I know of it, is still lacking a lot of these tools that would be useful to people. People are pushing it really hard but it is not ready for the masses.
Because, contrary to what you may think you’ve observed over the past ten+ years, copying and republishing anyone’s content without their permission is a US copyright infringement.
So yeah; if you want to get their permission, ensure all their links and such are migrated over, and do all the work for them to mirror content they’ve created without the benefit of making any money on it, have at it.