It's not uncommon to use "sic" as a sort of irony punctuation mark.

Interesting. I've always known "sic" by it's canonical usage: to point out an error in someone else's quotation (perhaps with some sneer).

Wikipedia actually shows this newer usage of it. From https://en.wikipedia.org/wiki/Sic#.22Ironic_use.22_of_sic:

  "Ironic use" of sic[edit]
  Occasionally a writer places [sic] after his or her own words, to indicate that 
  the language has been chosen deliberately for special effect, especially where 
  the writer's ironic meaning may otherwise be unclear.[18] Bryan A. Garner dubbed 
  this use of sic "ironic", providing the following example from Fred Rodell's 1955 
  book Nine Men:[2]

  [I]n 1951, it was the blessing bestowed on Judge Harold Medina's prosecution 
  [sic] of the eleven so-called 'top native Communists,' which blessing meant 
  giving the Smith Act the judicial nod of constitutionality.

I think "crappybird" is being ironic and making some sort of meta-comment about how Android may be free-as-in-beer, and somewhat free-as-in-speech, but it isn't really free because REASON GOES HERE.

I think the implication is that "free" is being quoted from elsewhere and the author doesn't necessarily agree that it is without cost just because such cost is not denominated in dollars.