The problem is Google - according to their policy for developers, "[The developer is] responsible for ensuring that third-party code and practices do not cause [the] [...] app to violate the Google Play Developer Program Guidelines." So if any mod violated Google's guidelines, the devs would be responsible. Overcoming the apple app store's guidelines would be a bit easier (the website already has most of the stuff they require, like the ability to report and ban people), but they'd still have to make mod makers give things like contact information
The problem is Google - according to their policy for developers, "[The developer is] responsible for ensuring that third-party code and practices do not cause [the] [...] app to violate the Google Play Developer Program Guidelines." So if any mod violated Google's guidelines, the devs would be responsible. Overcoming the apple app store's guidelines would be a bit easier (the website already has most of the stuff they require, like the ability to report and ban people), but they'd still have to make mod makers give things like contact information