Information ownership
Service's rights to user information and user's data, user's possibilities to remove or move data back from service
Monetisation model
free, freemium, advertising, non-profit community, estimate of service's continuity
Information security and privacy
published data breaches, location of information, technical implementation, collection of user information
Authentication and user account management
a dedicated user account needed in the service, forced use of third party accounts (Facebook/Twitter/...), possibility of strong or multifactor authentication, possibility of anonymous use, possibility to remove user profile
Multilinguality, support and user documentation of service
multilinguality of the service, support and user documents and functionality of support