I have no idea where Null is getting the idea that video game streams don't qualify for 'gumroad content'. Is it because it takes too long to get through a game? Is it because Gumroad content should be covering random things? I don't get it. If there was some kind of memo that got put out on what qualifies as Gumroad content then someone please tell me because I have apparently missed it.
If there isn't one, then here's an idea, just do content that you enjoy doing. Even if it's just the same thing as MATI but without the chat and more in-depth on one subject, that's fine. If you don't want to do videogame content then sure, don't do it because it would feel forced. I'd be much rather interested in seeing Null play a game that he enjoys than see him play one he doesn't get any fun out of. I understand that there's a reason behind him not wanting to display things he likes because of sworn KF enemies hunting down such things, but man you gotta enjoy what you do or else it just won't happen.