What are dog tag + bow + no kill servers?

When I browse online servers I see many examples of low population servers with a description such as:
dog tags no killing
or
dog tags / bow - no killing
When I join and get one kill I often get kicked by the admin. I have also been kicked within two minutes of joining (despite not killing anyone). I have tried following people around but I cannot figure out what they are doing.
I have experienced this on the Xbox One but this may also occur on other platforms.
Why are there so many of these servers and what are people doing in them?
Best Answer
I did a quick google search and found out that those servers are mainly for stats-padding/boosting.
Basically, these servers are for people that want to get a dog-tag (or similar) the quick and easy way.
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