According to Bloomberg[0], non-gaming clients make up 10% of Unity's business.

> [Unity] helps Volkswagen AG train employees, was used by filmmakers to shoot the recent “Lion King” movie and by the Hong Kong International Airport to simulate changes in passenger volume.

I don't know enough about these domains to say whether it's a good (or bad) idea, but I've also heard of Unity being used for other kinds of modeling and simulations too (climatology, traffic, etc).

[0]: https://www.bloomberg.com/news/articles/2020-05-07/unity-tec...