Slack was never an innovator. By the time they showed up there were lots of chats apps. They just managed to go beyond the others by basically embedding a browser engine into their app at a time most thought of that as heresy, I mean a chat app that requires 1Gb to run was a laughable proposition to us, techies. But here we are… MS Teams is even heavier, but users seem to care nothing about that anyway.

They were never an innovator, they just did this thing nobody else did, that some years later became the norm?

Blitzscaled? Yep.