Permissionless means when you don't need to comply. Censorship means freedom to post anything.
"Permissionless" is the better wording than "censorship resistance" because every permissionless system is inherently censorship resistant: If you can join pseudonomysly and permissionless, you can circumvent censorships. The vice versa is not true: a system that is censorship resistant is not necessarily permissionless: e.g. a secret and exclusive group can circumvent censorship but is not permissionless.
Therefore "permissionless" is the better word.
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