The reason to provide some sibyl protection/spam protection mechanism is so that every one that wants to contribute can do so. The ceremony is secure if there i

The reason to provide some sibyl protection/spam protection mechanism is so that every one that wants to contribute can do so. The ceremony is secure if there is 1 out of N that correctly destroyed its secret. You individually, may not trust any one else, but then you should be allowed to contribute a secret and delete it, in order for you to trust the ceremony output. If you are prevented from contributing because there are bots filling up the queue then you won't be able to trust the ceremony. I think it's a sensible constraint from the crypto fetishists.