Betting with online gambling firms will shield you from contracting communicable diseases because you are all alone in a comfortable atmosphere.
Yes, betting online is definitely a very good option to avoid being in some bad casino or betting office environments but it is a very wrong thing to think that you can only catch diseases from physical casinos or betting offices. For example, in the middle of the pandemic when more and more people were getting infected with the virus, everyone was recklessly shopping in markets but not going to restaurants, cafes, casinos or similar entertainment venues. So, what happened? Many people, who thought they were especially careful caught the disease even though they just went to the market and their test results were positive. In other words, just going to a physical casino doesn't prevent a person from contracting a disease or virus. Moreover, it is possible to minimize this possibility by choosing quality physical casinos or betting offices.
In summary, just because a person doesn't go to businesses such as physical casinos or betting offices due to his/her health condition, doesn't mean that that person will never catch a disease or catch a virus. Under-the-stairs physical casinos and betting offices may be a factor that increases these possibilities but in the same way, under-the-stairs businesses in any different sector will also increase these odds.