a preface: i am appreciative of people being curious and excited about linguistic innovation and change! its neat to see people talking about the ways in which speech, and particularly online speech, is adapting to fit new needs of language users. (i also want to say that i strongly disagree that this is something to be "horrified" by. language change is always happening!! and being afraid of it or hating it is a form of linguistic prescriptivism)
all that said: nothing in this thread has to do with pronouns ;;w;;
they're just talking about chat being used as a collective noun, "chat" doesn't actually replace any noun
and like, yeah, there's probably some really interesting questions about the ways in which people engage with streams and parasocial relationships linguistically, including the use of "chat" as a collective noun! (or like. idk, swifties/BTS army or whatever other like fan groups)
but people need to engage with actual speaker data to do that, not just armchair linguist their way through things that sound like something a streamer might say