>If a new company / protocol came about which wanted to try their hand at a different way of sending online letters, that let you delete them later then I'd hav

>If a new company / protocol came about which wanted to try their hand at a different way of sending online letters, that let you delete them later then I'd have no problem with that. I don't think this is a particularly well-advertised feature of Viber. Neither reddit nor hn are meant to be a means of private comunication. Generally you can't view them offline, and so on. I'm not sure about slack >that's not how email works And I think the average user's expectation is that a messaging app will work the same. By the way, reddit won't let you delete PMs you've sent to another user.