I think I know a possible reason, Kotlin, that this tool may be well known in other countries, but it's almost unknown in China, so Chinese phones may not be compatible with it.
I recently received feedback from some Chinese players that they couldn't install the latest version of Uniwar on their phones. I tried using my OPPO phone, and the problem did exist, prompting the app not to install whenever I tried to install it. I suspect it has something to do with the recent introduction of new technology.
The phones that have this problem are mostly made in China, with HUAWEI and VIVO and my OPPO.