If a piece of software requires you to pay to use it, then pay for it. We do not accept warez nor do we permit any member to promote or describe ways in which Warez, cracks, serial codes or other means of avoiding payment, can be obtained. This is a site of developers, i.e. the sort of people who create such software. When you cheat a software developer, you cheat us as a community.
It does not matter if the coins can be earned during game play. Since they can be purchased from the play store than these hacks become warez.