Critics like to say "it doesn't work", then the next day complain about how it enables a ransomware plague. You can't have it both ways. The fact is it clearly works.
This isn't to say it's magic; it doesn't protect you from bullets any more than it makes you coffee. It is not a magical unicorn; just finding a reason why there might still be censorship somewhere is not a valid argument.
Free speech laws work even if Facebook deletes your post, or you a fired, or sometimes someone doesn't appeal their conviction. Your argument about "miners, developers or exchange operators" existing is not any more valid than this one is.