It has been brought to my attention that there are a couple of old updates that have been spammed with bots:
Many of these posts even date today. @Sirrian and other devs, are you aware of this? Requiring an account to comment, while inconvenient, may act as a temporary or even permanent fix. None of them have tried occupying recent updates, but it is only a matter of time before they do.
Oh, newish ones have it too it seems, just not as bad: