My recommendation is to do a proper research on the given app... which in most cases is easier said than done. We actually had a discussion on this back at Ignite, and the fact remains that Microsoft must do a better job in documenting and enforcing guidelines on presenting information all those questions, and more. Sadly, so far the approach has been "lets get as many apps as possible so we can have nice marketing posts around it".
Heck, some of the apps out there don't even have proper author info.
Best Response confirmed by
Badal Ratra (Frequent Contributor)