Just because the snail mail delivery system is pretty much gone that doesn’t preclude the software (i.e, ‘apps’) being developed separately from the distributor. The distributor subcontracts out development. Then sticks his name on it and just sells it through his server.
wait until the DEI brightlights at CIA/FBI/DIA etc find out that Russia has been using typewriters and mailboxes the last 10 years...and its all because Trump has been colluding with Putin /s
https://www.fastcompany.com/1673000/to-combat-leaks-russia-brings-back-the-typewriter