The account can be changed so only followers can see the tweets, but to keep the 1:1 ratio so ex-members can't continue to access them, it would require manually picking off the followers that cancel their LVA Sports membership.
Also, retweets can't be stopped, so if one of us decides to share, that's the way it is, although that's the case today as well via message boards, of course. It's just a lot easier to retweet.