Brian Acton, WhatsApp co-founder, one who left Facebook post-acquisition, infused 50M USD into Signal. And, Signal is community-supported through donations. I hope that Signal remains here for a long time.
Anything not decentralized is going to get abused eventually. The US government could seize the client signing keys, release s backdoored client, and dump the SGX keys and gag order everything in the name of national security. We have seen similar play out in China. Even the mighty Apple gave up HSM keys and caved to CCP censorship demands. It is only a matter of time.
I fear they are well meaning but woefully naive.
We need censorship resistant standard protocols anyone can implement and help host so there is no SPOF.