A professional ballerina who joined adult site OnlyFans to boost her meagre earnings as a dancer has warned of the brutality of the porn industry. Photo shows former ballerina Avva, undated. The woman, 21, from Vienna, Austria, works 80 hours a week on OnlyFans to support herself. (@avvaballerina/Newsflash) The 21-year-old dancer, named only as Avva in a new documentary about the porn industry, warned would-be adult actresses away from hard-core…