As with all games, there are bans, this is to help protect us as well as you from potentially mischievous and malicious players.
A few things we may ban for.
Please note, communities are free to enforce their own rules, and bans, however if when you join a server and you get returned to the lobby with a message such as "Admin Ban: ws12345", it is highly likely you're banned by us, meaning you've come to the right place.
If however, your ban message differs, you will need to lookup the community which runs that server, for a list of our partnered communites please checkout this page. If the community isn't listed here, we are unable to support your inquiry.
We share our bans across many communities within the Arma franchise, they themselves choose to opt into running these. They are not forced at all, with the exception of all official King of the Hill servers.