Ah, yes...Rules, Rules Rules of the JWs. Some are clear cut. Some have gray areas. Most, however, are in place to make the Witnesses feel guilty about everything and, in the end, the average JW will simply err on the side of caution so as to not feel guilty.
Example: Smoking is not allowed in JW land. Neither is playing the lottery. However, tons of JWs work as cashiers at places which sells these items. The JW cashier handles these items every day, literally touching the items and handing them to paying customers. But, I have never heard of a JW quitting this type of job due to feeling guilty.
But if I were an active JW and tried to purchase a lottery ticket, I would feel guilty. Honestly, when the lottery had a high payout, I would secretly buy tickets, but I felt guilty. And then, when I inevitably lost, I would repent and vow never to do it again. Until I did. LOL!