This is great feedback. My interpretation of the clause is that we can use services like Mailchimp to send you marketing materials for when we release new products and features. These would be strictly opt-in.
I'm not a legal expert, but I will try to come up with a policy that more clearly expresses that you will NOT receive marketing about third-party services and our only usage of these services would be to update you all on our new product offerings.
We're considering offering E2E encryption, but we believe that we can deliver a ton of value by allowing users to search through their messages and for us to efficiently organize and categorize your content. I think there is a middle ground where we can encrypt non-pertinent data, but still preserve metadata so we can provide some intelligence on top of the content you choose to share on the platform.