Some random examples for comparison:

1. Apps. They permit exactly what the app developer (usually a corporation) lets us do in the straitjacket they set up for us and no more.

2. Oil paintings. I can do lots of things there (no animations though) but sharing with the world is difficult and expensive.

3.Mechatronic contraptions. Lots of possible creativity there, see Burning Man. But hard to do, expensive, and even harder to share.

The Open Web? Trivially easy in comparison, and multi-medial.