Ask HN: Server providers missing from privacy policies?

I reviewed a few privacy policies of SaaSes and they don't mention third-parties that they obviously use, like:

- server providers (hosting)

- email sending services (like SendGrid)

- other SaaSes they use like error tracking, backup hosting (S3)

In many cases these SaaSes host personal data in unencrypted forms. Yet the privacy policies mention that they don't share these details with anyone.

Shouldn't they list all used third-parties?