… agreeing to be directly compatible with Whatsapp would mean they agree to surrender the privacy for every single instance of Signal-WhatsApp communication.
If the whole reason for your foundations existence is privacy, it seems that it would be an existential danger to create a partnership with the implicit understanding that it will destroy privacy.
Those choices don’t occur in a vacuum.
What do you think happens to the nonprofit foundation built entirely around a fanatical devotion to privacy, if they partnered with Facebook. Not just partnered with, but in doing so, weakened the overall privacy of their platform.
Putting aside adoption rates, how does that impact their organizational sustainment and viability e.g. their ability to draw in donations, retain talent, or stay independent?