This site did not show evidence of storing passwords in plaintext.
This site does allow secured connections (https)
This site did show a clear way to unsubscribe from their emails
This site does verify your email address.
Below is a sample of the emails you can expect to receive when signed up to File Market.
Hey, we''ve just finished setting up your account where you can start to exchange digital products for emails that will be added to your email list. We have connections into the following email platforms, with more being added shortly.