It's possible, but it can be avoided if theymos decide to pick people who want to volunteer instead. There's some people who actively combat spam and theymos could recruit them.
I think volunteerism is not enough to be appointed as a moderator. Some people only shows an act of volunteerism in order to gain reputation and later behaves like a scumbag. There should have a screening tool maybe when appointing a moderator just like becoming of a merit source.