> has very strong incentives to maintain your privacy
> their incentives aren't really aligned with yours
No, they have a very strong incentive to appear to maintain your privacy. And that's only temporary.
Don't fall for any company saying that they're doing something in the user's interests. They aren't. Companies exist to make profits, if for a brief period of time that means helping users in some way, it's only a coincidence, and you're being fooled by it.
Take a look at China, Apple didn't even blink before deciding to hand over all data to the Chinese government.
I trust companies, because I know exactly what matters for them: profits. I trust them to follow profits and act on their best interest.