Well that's probably going to suck for everyone who convinced their non-technical parents to switch to Signal.
"My bad, this easy SMS client I got you to switch to is going to stop supporting SMS, and we're going to have to export all your old texts or they'll be gone forever."
"My bad, this easy SMS client I got you to switch to is going to stop supporting SMS, and we're going to have to export all your old texts or they'll be gone forever."