At least in use cases I was dealing with - we wanted zero filtering of inbound SMS because it was used as a control interface.
Spam didn't matter to us. Spammers had no idea how to format their messages etc. We also whitelisted inbound numbers.
The Twilio use case is not primarily for "mailing lists" and third party sms forwarding stuff.
And for a while SMS worked very well in certain IoT's contexts (SMS used to basically have its own channel that had surprisingly good deliverability for some reason).
Internationally in particular voice and data used to be potentially wildly expensive.
For sat backhaul, you could get 10 to 25 cents a message. A voice minute would be like $5 - $10. So this is a 100x difference potentially. Even data minutes were like $1-5/minute way back. The connection setup and teardown times were lower with SMS then doing a voice channel call etc. Pricing looks a lot better now, but still, messages are cheap (or free).
How does twilio even know that you will only forward messages they have scanned for spam? It seems like they MUST put the spam filter on the outbound leg.
At least in use cases I was dealing with - we wanted zero filtering of inbound SMS because it was used as a control interface.
Spam didn't matter to us. Spammers had no idea how to format their messages etc. We also whitelisted inbound numbers.
The Twilio use case is not primarily for "mailing lists" and third party sms forwarding stuff.
And for a while SMS worked very well in certain IoT's contexts (SMS used to basically have its own channel that had surprisingly good deliverability for some reason).
Internationally in particular voice and data used to be potentially wildly expensive.
For sat backhaul, you could get 10 to 25 cents a message. A voice minute would be like $5 - $10. So this is a 100x difference potentially. Even data minutes were like $1-5/minute way back. The connection setup and teardown times were lower with SMS then doing a voice channel call etc. Pricing looks a lot better now, but still, messages are cheap (or free).
https://www.satphonestore.com/airtime/iridium-airtime.html
How does twilio even know that you will only forward messages they have scanned for spam? It seems like they MUST put the spam filter on the outbound leg.