I'm in the same community as this fellow, and my perspective is fairly similar. There is either a dancing fear, selfish control, or general mistrust from the scene kids who have at least a semblance of knowledge on WebTV that they just don't wish to share, which is very frustrating. WebTV itself isn't restrained to the Dreamcast. If you explore MattMan69's website, where he has documented his escapades as a hacker on the service, you'll see that he and his compatriot have created
- A self-hostable server emulator that, as mentioned in OP's post, is written in Perl, and which mimics the most basic elements that work on WebTV and MSN TV hardware
- A modified version of the WebTV Viewer program used by WebTV Network Inc. employees to test and develop the software, which is set to connect to that local server emulator
- Custom builds of WebTV and MSN TV software for real WebTV/MSN TV set top boxes that, you guessed it, connect to the server emulator
- A custom build of "Microsoft WebTV Connection Kit" for the Sega Dreamcast, you get my point
- A modified DreamPi image that enables the WebTV/MSN TV set top boxes, or "Microsoft WebTV Connection Kit", to connect to, again, that self-hostable server emulator.
But most of WebTV is similar to what the original Dreamcast website would have been, with community boards, news, and naturally, the ability to surf the web like we have with PlanetWeb, Dreamkey or Dream Passport.
It's the matter that there's a LOT more about WebTV than we currently know, and we're just trying to get closer. Assistance with locating discussions of WebTV in the Japanese region (such as from the official Dreamcast magazine) and translating them can teach us a lot about the decision, the confidence Microsoft had, and maybe will give us insight on things we weren't aware of. This was an alternative option to getting your Dreamcast online in Japan, the only other choice was to use Dream Passport and Dricas.