So, really not a bubble. Right in the heart of flu season, many of them in a country where an element of the population clearly doesn't give a shit about distancing or protection. What can possibly go wrong.
See this post so I am not answering twice.
News Article: - 2020-21 Season
NHL ran a 100% success rate coming out of Phase 3. Sure during an entire season some players may get it, but that is the risk everyone takes every single day.