I’m not sure if it’s every ADHD person, but I have accidentally quit smoking.

If you can accidentally quit a physically addictive habit, things like brushing your teeth don’t stand a chance.

I think it’s more just because we’re early adopters and the first wave of refugees.

Yes, and because there are some little hurdles in the signup process. Having to select an instance isn’t really that big of a deal, but it will actually stop quite a few people.
The people who do make it through care or are invested enough to join and are less likely to shit the place up. It’s a self-selection process.