Actually Macromedia didnt invent it either. A small company called "FutureSplash" had a software called FutureSplash Animator. Macromedia bought it in the late 90s
The two companies kind of merged and Adobe continued to employ some of the original members from the Flash team
That's disingenuous. Adobe didn't invent Flash, they bought the company that did. Adobe's strategy is based on them having resources to acquire, not create.
This letter might have been written by one of the guy in the original Macromedia team.