It seems that the Fine Bros. have since taken down their videos and released a statement reversing the trademarks and stopping React World.

Link to statement: https://medium.com/@FineBrothersEnt/a-message-from-the-fine-brothers-a18ef9b31777#.u4anl18r3

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Retropalooza’s Website:
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Music by:
Jason Hooft:
Youtube: https://www.youtube.com/user/3killabytes
Music: https://sickids.bandcamp.com/