Yet again you're just stating a technical description as if it implicitly justifies the state of things. Nobody here is confused about how Twilio can legally do this or how market incentives encourage them to do so.
We're discussing a higher level behavior and what ought to be. And getting a critical service pulled out from under you based on overzealous unaccountable spam filtering is certainly not what ought to be.
We're discussing a higher level behavior and what ought to be. And getting a critical service pulled out from under you based on overzealous unaccountable spam filtering is certainly not what ought to be.