Ultimately, I think it's important to never forget that your fellow mushers are essentially strangers with similar interests. It's not like this is a philosophical or religious support group. We aren't bound by common interests related to ethics. It's a hobby, and with that hobby comes regular depictions of relationship drama, sex, and violence.
We've had discussions about Why X game is better because it allows sex with characters depicted as minors and whether or not rape scenes should be permitted on game.
So, with this in mind, it's important to remember that these people are strangers. They could be anyone: Ex-cons, sex offenders, people with obsessive/violent histories, undeclared mental and emotional disorders, or the classic bitterness that comes from dissatisfying personal lives. You can never control what these people do or how they react, or to what degree they will try to satisfy whatever sense of vindication they feel is due.
So, unlike twitch streamers, we have the ability to use email, lack of names, lack of pictures, etc. This will make it harder to socially engineer all kinds of threats on a data/personal/family level.
Just never forget that these people are strangers, and when it comes to the dangerous ones, a stranger can become someone more dangerous very quickly over any manner of social sleight.
I've seen prince charming become a stalker in 2 seconds flat.
Please, god, for your own safeties, never forget that these people are strangers.