1mobile looks like a chinese site to me. their bad english is one giveaway.
not necessarily bad, but China is not renowned for respecting western copyrights.
so long as they don't have your credit card number you should be OK
I did a test search for Mantano reader & found only the free versions, and only the demo version of calibre companion, so they are not blatantly giving away paid apps
if everything is free, how can they be making any money though ?