I think this is interesting in sort of a scifi way because if you can establish a reliable enough characterization of "tone" then maybe you can then create a st

I think this is interesting in sort of a scifi way because if you can establish a reliable enough characterization of "tone" then maybe you can then create a steganographic side channel out of deviations from that tone: so your adversaries see inane blather about something unimportant, but your comrades can decode the blather into more meaningful messages. Meanwhile, others are hosting your communications for free because what is actually cyphertext appears to them as engagement.