In Android Pie, Google blocked custom substratum themes from being installed without root. Users were outraged but Google claimed that it was for security reasons that they blocked the install. Apps like Substratum still have ways to install themes on Android Pie, but it requires root. On Samsung Experience 10, though, the Substratum team was able to get their theme engine working without root by using the Samsung theme engine. Users running the leaked Samsung Experience 10 beta on their Snapdragon Samsung Galaxy S
