There's also a Yamaha MT Owners Club (
Yamaha MT Owners Club - MT Owners Club) which has an MT-07 section. Though to be fair it mainly caters for the original MT-01 and to a lesser extent MT-03. And as far as I can see that doesn't have any official Yamaha endorsement either. In fact the only forum I've come across that does have manufacturer support is Kawasaki, though there may be others, of course.
But I do tend to join up a relevant forum when I get a new (to me) bike, or even sometimes if I'm considering buying one, to see what possible issues there are as well as for technical help and advice. I'm even on one for my car, which I joined when I was having gear selection probs.
The thing with online forums, particularly if you go to meets, rideouts etc., is you can make some good mates through them - which is good. But when you get rid of the bike they cater for you stay on them to keep in touch. So I'm still on the Yamaha Diversions (last Divvy sold about 6 years ago), Yamaha Thundercats (sold three years ago - that's the bike in my avatar), and possibly a couple more that I don't visit regularly.
I don't see that it's a big issue to have more than one forum catering for a particular bike - we're all bikers, after all. I'd rather we didn't get into a People's Front of Judea vs. Judean People's Front argument!
