The chain you found, OP, resulted in 2k+ deletions. And I just nuked another ~30 accounts behaving similarly, posting minor variations of the same thing hundreds of times. Really annoying. If anyone sees more of this nonsense, please report it.
The sad thing is this will just be the tip of the Iceberg. There are numerous people farming dozens if not hundred of accounts this way just by posting "nice project" or "waiting for bounty/airdrop" or whatever.
We're also currently being spammed by a new wave of bots that copy a random post and paste it in another random thread. They're pretty easy to spot as the posts are way off topic but there's seemingly hundreds of them. Must have nuked going on 50 already since yesterday.