This list was nice to learn about some apps I wasn't yet aware of. One thing the author mentioned as a "con" a couple of times is "No option for automatic deletion of messages". It might be worth noting that no app can provide automatic deletion of messages. Yes there are some apps that have messages disappear after a time but there is nothing stopping those messages from being saved by the other party before that time. If not a data export then a screenshot, and if not a screenshot then a camera pointed at the screen. If the message is to be consumed by a human then it can be recorded.