How is this spam? Are tiny transactions like these considered to be spam?
The transactions have a public note on them, saying their website. Blockchain also has a feature to label addresses, and Laxo Trade is using an address which is labeled with their name and website.
The public notes are actually only available if you use the blockchain.info block explorer, otherwise they will be invisible to you (they are not actually on the blockchain).
Most importantly they are paying an appropriate miners fee therefore are essentially paying to help keep the network secure
I kinda agree with your theory, that they are helping in the long run.. so maybe they are advertising too, but at least they are paying the miner fee for the advertisements. I really dont see any harm unless there is some kind of ulterior motive. Most folks in the crypto world are smart enough to understand that HYIP's just don't work. So if we are making something out of it and there is no way they can hijack your BTC wallet, i dont really see any harm