The letter didn't provide a reason, just that the members voted at their annual meeting to expel me from membership (lol) and that it would be effective 4/x/2019. There was a DoC post about it, so I'm assuming they just voted on a large list of people who were depositing MOs or MSing their 3% card. I inquired about more information/reconsideration, but they haven't yet responded. If the consensus is that an "account closure by the CU" notation on EWS/Chex is not problematic toward opening new accounts or undue attention on existing accounts, I'm thinking I'll just leave it open and hope they reconsider closure.