Report tool on PBE? Worth or Nah?

Seriously, What is happening with PBE? Should be a place a have fun, test, explore... But everyday more I see things like this: This tristana was bashing everyone in game and post game, even the enemy team... And these kind of people doesn't seem to be banned or even timedout in some way. So Riot, please, do the report tool on PBE works or is just there for aesthetics? Edit: removed names
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