Subversive spam is different
Subversive implies political and effectively implies a bias. One man's subversiveness is another man's progressiveness.
Some people think that threats to "water the tree of liberty" and to secede from the union are subversive whereas others view them as patriotic.
I guess my point is how can you call something subversive without making the subjective value judgement of the rightness of one side versus the other? Particularly since no matter which way you decide large numbers of folks will in all likelihood vehemently disagree with your judgement.
Unless of course you meant something else entirely by subversive.