Exactly.
User is basically selling his personal documents copies for $8.

If someone wants to buy your documents copies for $8, certainly he wants to do something with that.

A few options:

-Bitwala may want to inflate their list of investors with fake clients, such as OP.
-Bitwala may be willing to sell those documents to a third party who also needs to inflate their numbers.

Even your reputation is at risk, as you don't know what a third party will do to your documents.

Everything that is on the web you can consider it exposed and leaked.