Signal is a non-profit, not a traditional for-profit business, so not sure what you mean by “corporate customers.”
That’s a very common thing that non-profits and for-profits operate under one umbrella. For example Mozilla Foundation is a non-profit as well but own a for-profit subsidiary Mozilla Corporation.
Signal does not, since they use Sealed Sender.
So Signal’s corporate customers (like Meta with WhatsApp) do the same then?
Can you clarify what you mean? Signal is a non-profit, not a traditional for-profit business, so not sure what you mean by “corporate customers.”
That’s a very common thing that non-profits and for-profits operate under one umbrella. For example Mozilla Foundation is a non-profit as well but own a for-profit subsidiary Mozilla Corporation.
Through its CLA Signal sublicense all contributions: https://signal.org/cla/
Signal works with Meta, Google, and Microsoft (and probably others) to integrate the Signal libraries and protocols under propritary licenses:
Everything was announced and is documented on Signal’s own website.