This is a constant problem on our server, we have had our player names taken by hackers, they come in ask whose admin, then suddenly we are banned or our names are taken by these hackers, they enter the server chatting like they are the real owner of that name.
This is so frustrating, if your not waging war at multiple fronts getting rid of players who drop nothing on death, when the server setting is toolbelt drops on death, or hackers/dupers coming along to spam keystones all over the map, Bedrock buildings, safe spam all along the countryside, one punch kills, spawning items not available to craft, speed hacks flying hacks. the list goes on and on.
Your game is being corrupted, and the measures taken to prevent that is getting pooped on by these hackers, admins can only do so much. Help us fight against the hackers so your game isnt tarnished further.