By Byron Kaye and Praveen Menon SYDNEY, September 29 (Reuters) - For Rhys Wareham, a umber manufacture technician from Sydney, the begin of COVID-19 lockdowns in 2020 did not but mingy staying home, but having to full stop visiting the taphouse every good afternoon to gamble on stove poker machines. So he switched to a smartphone app which lets him trail bets on his best-loved sport, baseball, no count...