This is like saying a Swiss bank would share your secrets because shady people use Swiss banks. No. Confidentiality is literally built into their business model. Getting caught sharing customer data is one of the fastest ways for their business to crumble.
How does it not make sense? Companies all over the world trust their proprietary data with Palantir platforms. There’s no way they would do this if they thought Palantir was actually sharing data without their approval. If they were found out to have done this, companies would cease to trust Palantir and stop working with them