I believe the original reason was the founder wanted a way to have his guitar teacher share tabs and give A/V feedback on his guitar playing. It was originally a product for teaching with limited sharing features, then the founder realized it could be used for many other use-cases and expanded to be much more collaborative and became essentially a multi-room collaborative virtual desktop-like experience.

We use it daily for things like standups, sprint planning, all hands, operations dashboards, product roadmap discussions, dungeons and dragons sessions, watching videos together and more.