Turns out that Comcast probably just does not understand tor - specifically, the difference between exit and non-exit relays. See https://lists.torproject.org/pipermail/tor-relays/2023-June/021208.html . And not enough evidence that Comcast really blocks connections to tor relays, just ALL connections from tor relays.

So raising awareness about that difference could be a way to go. Perhaps we should bug EFF that they do/join such awareness campaign? Repost / retweet. And help me with short-enough slogan or hashtag, because #TorNonExitRelayIsNotAThreat seems too long to me. But "relay" can refer to an exit relay, and those could be a threat, so mentioning "non-exit" seems inevitable.