Piracy of games and software has been around since the dawn of home computers(BBC Micro, ZX Spectrum etc.) and the problem with Patreon is it allows some developers to milk their members and in turn encourages Piracy, Kodaman at least offers the game on Steam for free once you've pledged at least £25 in total. The problem in adding DRM in unfinished games is that it limits people that want to try the game before buying it and limits the scope of bug testing and discourages people from wanting to try it. At least that's my opinion.