I'm not the parent but he's probably referring to the opinion of some that SD is the equivalent of a spammer and its transactions should be blocked. You can find lots of threads on bitcointalk.org discussing it: https://bitcointalk.org/index.php?topic=150405.0
SD notifies losers by sending them a very small transaction. Because of this SD generates the majority of BTC transactions and inflates the size of the generated blocks.
There were a few more discussions around this time too, a few people including a pool operator want to block all businesses and applications that "abuse" the blockchain. This shows that a few higher ups in the Bitcoin community are short-sighted and very selfish, and also shows the problems Bitcoin will have at getting any larger.
SD notifies losers by sending them a very small transaction. Because of this SD generates the majority of BTC transactions and inflates the size of the generated blocks.