There are only 3 real challenges to free speech at the tech level a) the need for CDNs at scale b) distortions of net neutrality c) nation-state firewalls.
All other claims are about social governance on private sites, where applying free speech doctrine is a stretch at best
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The fourth is having a tamper-proof archive. It's way too easy to muddy the record post hoc.
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Fifth is some semblance of private communication.
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