It also constrains people from participating in the community if the things they support or object to would cause harassment or harm from people who know who they are, which is not always preventable, for example a shared household, using kbin from work (activity monitored), etc...

I could easily see an Amazon worker getting fired because they were logged upvoting pro-union threads. They wouldn't even need to be doing this from a company network - just accessing kbin once on their network for any reason would have their user name associated with them, and then Amazon can simply monitor their activity on kbin even when they are using it from home.