"Open Source Video Game Hardware" is a misnomer. Video game developers (ie: EA or Activision) demand DLC and DRM models to extract more money out of "whale" video game players. A leak like this harms the #1 customer of a console: the 3rd party developers.
Even if a console is a hit with consumers (ie: Dreamcast), if it is opened up for easy piracy and loses DRM protections, the 3rd party developers will stay away, killing the platform.
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For a more modern example, consider Ouya vs Android vs iPhone. The locked down "walled garden" DRM model wins for developers, even if it loses on consumer freedom.
They then did a surprise launch for the $400 Saturn months earlier than expected. Retailers were not prepare, developers were not prepared and consumer were not prepared. Due to the shortage of available units SEGA only allocated unit to big box retailers. K.B. Toys was so angry that they vowed never to sell the Saturn and really never sold it. Developers did not have their games ready for the surprise launch and were pissed off about it.
SEGA handles the launch so badly that at E3 that year for the Playstation keynote on the upcoming launch Sony just went up on stage and said "$299" and left the stage after. Here is the clip https://www.youtube.com/watch?v=ExaAYIKsDBI
The Saturn was horrible to develop for due to its complex and cobbled together design and SEGA's development tools were lacking and developer had to make their own tools. Sony on the other hand made sure developers got everything they need to take advantage of the system. SEGA then prematurely announced the death of the Saturn before the Dreamcast was even officially announced.This was a fuck you to developers once more who still had games under development for the system. The Saturn did not even get an original Sonic game....likely really
SEGA later would announce the Dreamcast and got everything right with this console but at this point the damage was already done. Consumer wanted nothing to do with SEGA, developers were skeptical, EA never supported the Dreamcast and SEGA had already burnt through all their cash. Their president had to bail them out with his own money, he would later die.
Sony and the Playstation 2 hype machine was now in full effect. People were waiting to see what Sony could offer to compete. Sony was promising Toy Story graphics and all sorts of nonsense and people ate it up, foregoing the Dreamcast to wait for the Playstation 2 launch the following year.
There was an in depth analysis of Dreamcast sales done a very years ago and it was determined that the sales of the console did not increase when the system was "cracked". This meant people were just NOT buying the console period as opposed to buying it to just play pirated games. So it was not the piracy that killed it.
SEGA just could not compete against itself and Sony any longer.
SEGA really did get everything else right with the hardware; even having a semi-handheld as part of the controller. The market was just not ready for it.
But anyone with a CD burner could make illegal copies. I was like 15 at the time, and hardly technically savvy, yet I had tons of pirated games for the Dreamcast. At least the PSX required mod-chips to play pirated games.
Sales were pretty strong for the console for the first year or so, and the first-party titles available were really strong. But hardly any third party devs made games for it, particularly EA, so the console lacked staying power. There's only so many games SEGA themselves could afford to release.
I'm not convinced. I only heard about the ability of playing regular CD-ROMs on Dreamcast way after it was already dead. If anything Dreamcast is a great example of terrible mismanagement by SEGA.
And if CD copying killed the Dreamcast then the PSX would have been dead 3 times over. I knew tons of people that shared burned games for that one.
The Dreamcast also came four years later, which mattered; many more people had broadband connections capable of downloading a full CD-ROM in 2000 than in 1996.
That said, I agree with your first point - Dreamcast piracy really only became a thing after it was clear it would lose the market battle to the other consoles. Piracy didn't kill it, at most hastened the death by a few months.
The DC lost to the PSX and later the PS2 with the builtin DVD video player killed it.