3 year old account with 45k karma, very specifically avoided doing anything bannable, haven't been on reddit in two weeks, came back to this this morning.
Getting banned from Reddit is like receiving a restraining order from the local sewage processing facility.
Sucks to hear that you got banned without cause, especially given how cautious you were to avoid trouble, but take it as a good indication of how cynical Reddit admins are and how they will take any measures to ensure that the discourse on reddit will never be revolutionary.