There was already a consensus on where the line should be, it's people making arguments like the one you're making that are muddying the waters so they can "clarify" as you're doing and suppress speech. We already know where the line is.
The line is here: in a private communication between people anything can be said, nothing should be censored. if someone gets caught planning or doing something illegal they go to jail.
That was never the consensus or the “line,” because major chat providers never behaved in the way you suggest. They have always had rules that were codified in their Terms of Use, and have enforced them through various means.
Your absolutist position is interesting, but don’t make it sound like private carriers have ever been held to this standard.
Wait you started this thread making it seem like it was ridiculous to equate covid misinformation and other forms of objectional content (such as calls for violence), implying that you felt it obvious that allowing the former would not mean also allowing the latter. Is that not your position?
The line is here: in a private communication between people anything can be said, nothing should be censored. if someone gets caught planning or doing something illegal they go to jail.