To begin with, you've got a very narrow set of people who would even discover this project. Now intersect that with the people who will reliably miss context clues ("shitty network connections") to get a joke, and the set becomes even narrower.
I've had this project starred for at least 7 years, so perhaps Comcast legal has more of a sense of humor than we're giving them credit for.
Trademark and copyright tend to requirement historic evidence of enforcement to be enforceable in the future. If they fail to enforce this and it's significantly in the public sphere, it could be used as evidence the trademark and copyright no longer apply, depending on the judge.
However, if you do get the eventual C&D, you might as well tweet about it and get another 15mins of fame!
*Edit, if you think that a corporate legal team is allowed to display a sense of humor, you'd be very mistaken. Sure, some might be cognizant of their corporate overlords, but to think that they would let something like this slide once made aware of it would/could be an expensive mistaken idea to have
Comcast the ISP doesn't have to actively enforce against Comcast brand tires or Comcast brand coffee.
A lot of people are confused about this, and big companies use "we have to actively enforce" as an excuse to crush companies in unrelated fields. But you don't.