I don't disagree in principle but let's not conflate the trust required for proprietary software with the trust required for a service that is known to exfiltrate your data.
I may have read too much science fiction, but the mere fact that someone has full access to all my data worries me, if not because we don't know anything about which form of government we would have in, say, 10 years, and how easily a corrupt government could force those businesses to surrender that data in order to find their "enemies".
BTW, I don't live under a rock, I do online banking from the PC and have pretty much given up telling my lawyer and doctor not to use Whatsapp to send and receive sensitive documents, then keep them in their unencrypted phones, but that doesn't prevent me to be worried by how easy it has become to obtain personal data about someone for those who can.
BTW, I don't live under a rock, I do online banking from the PC and have pretty much given up telling my lawyer and doctor not to use Whatsapp to send and receive sensitive documents, then keep them in their unencrypted phones, but that doesn't prevent me to be worried by how easy it has become to obtain personal data about someone for those who can.