Insurrection: a violent uprising against an authority or government (source: "define:insurrection" search in Google).
The people there were very clear they were protesting against the government, and people died as a direct result of their actions, so yes, it was violent even if the majority of people who were present did not participate in the violence, which fits the definition of an insurrection. Just because the Hollywood version of it shows more bullets and explosions doesn't mean last Wednesday's events don't also qualify.
As for "The police intentionally .. let them in", if you intentionally leave your garage door open and everyone in your neighborhood decides to come into your house to yell at you, they're still trespassing and they don't have a right to take your stuff, or break your family photos. And in most states if you tell them to leave, and one of them then tries to force their way into the room you and your family are having dinner in, you're allowed to shoot them without charges. "They left the door open" is never a defense against trespassing except unless you're an actual six year old.
"Now the entire country ... is abandoning the concept of free speech completely". It's frustrating that people continuously need this explained. The right to free speech specifically does not allow you to tell another person to commit a crime. If they do, you are open to criminal conspiracy charges, even if you didn't think they'd go do it. If that crime involves something that resembles "insurrection", the consequences are more severe and I don't think the government would (or should) take it lightly.
But put all that aside. If anyone consistently used a popular service with language that then potentially incited a , I think we all know that company's lawyers would recommend that person be dropped from the service so that the company doesn't get sued by those harmed in the incident.