You've prompted me to go and double check, and here is what I've found.
Creating landing pages and implying that products exist when they don't, largely for the purpose of gaining sign-ups and assessing the potential market for such non-existent products is showing:
* a lack of empathy (they don't care how the user feels when they discover the "product" doesn't exist)
* cold-heartedness (similarly)
* egocentricity (they put their own concerns above others)
* manipulativeness (the landing page is specifically designed to manipulate the actions of the user)
* irresponsibility (implicitly claiming something exists, and not taking responsibility for their actions)
* a lack of remorse (they take the results and simply don't care).
These are many of the defining characteristics of a psychopath: http://en.wikipedia.org/wiki/Psychopathy
Note that, as it says on that page, this does not imply violence, and should not be confused with being psychotic, despite the similarity in terms.
It also says in WikiPedia:
... the term sociopathy is preferred because
it is less likely than is psychopathy to be
confused with psychoticism, ...
So yes, such behavior in which someone completely disregards the effects their actions may have on others and proceeds purely on the basis of what they think is best for them is a defining characteristic of sociopathy.