The technical details do matter quite a bit though, because the same logic could be used to ban (for instance) web browsers. Because the web is an open protocol

The technical details do matter quite a bit though, because the same logic could be used to ban (for instance) web browsers. Because the web is an open protocol that can be used to communicate with any website, even objectionable ones, every browser is an app that gives access to hatespeech content. Google may ban the 8chan app, but they don't ban browsers despite browsers being able to access the 8chan website. Of course, Google won't ban the web, but only because it doesn't suit them to. What we wind up with is Google having arbitrary control over which types of communication protocols are allowed on Android with no need to justify their decisions, because any protocol could carry hatespeech, and that's pretty concerning.