It's a myth. I just got back from Cuba and you want to tip in CUC's and take Canadian money. Please don't tip in loonies or toonies, they have to find a tourist to exchange them as banks won't accept them. For the maids I always left 2 CUC a day or 1 CUC with a small gift. Take gum for the bartenders, they love it. If you aren't emabarrased take tampons for the ladies. A CUC is a good enough tip most times but don't tip every drink or they will actually start to expect it. Hope this helps.

