The root of trademark law is preventing consumers from being confused or deceived about brand affiliations. I believe using a trademark to refer to the product/service symbolized by the mark is a protected case, so long as you are clear that no endorsement exists. Looking at your language, this is abundantly (and amusingly) clear.
You might have something to worry about with your insinuations about Dropbox though. I'm quite sure they are strongly pro-cephalopod.
The root of trademark law is preventing consumers from being confused or deceived about brand affiliations. I believe using a trademark to refer to the product/service symbolized by the mark is a protected case, so long as you are clear that no endorsement exists. Looking at your language, this is abundantly (and amusingly) clear.
You might have something to worry about with your insinuations about Dropbox though. I'm quite sure they are strongly pro-cephalopod.