They are helping the miners because they are paying TXs fees in blocks that are not full so the miners get more revenue then they otherwise would be able to get. The massive number of outputs they are creating has caused their "spam" to be received and noticed by a lot of people so they are getting a good amount of attention. I would approach them with caution as I would with any other business that I would need to trust my bitcoin with
Thank god transaction fees are not very low. It still doesn't seem to deter some people from spamming the blockchain.
What is the problem with this spam? Laxotrade is paying their fair share in miners' fee which is the same that everyone pays for a similar transaction.