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It's Open Source. Nobody needs to use it, and it's especially not all-inclusive. That being said, it's also not new at all as it's been around in most distros for well over a decade. It has its pros and cons like anything.
Your assumption that "freedom" has something to do with Linux writ large is misguided though. You have distros that have communal decision making, and if they find a benefit to systemd, then they'll use systemd. Don't use that distro if you don't like it. There's your freedom of choice.