not a private game mod, but for the indefinite run private games i've been in, i'd blame it on the fact that most of them have a relaxed check in ac with no oversight, conditions, or limitations. this means that you can have a starting pool of 20 people, a reasonably healthy number, and have 15 of them not tag but make ac and you're stuck with a bunch of deadweight.

because a lot of dwrpers love joining games and fucking hate tagging and will do anything to avoid actually tagging.