As someone who's launched small social-ish sites (non-porn), I've thought about this too. There's no way to keep your hands off the users' content, yet that can

As someone who's launched small social-ish sites (non-porn), I've thought about this too. There's no way to keep your hands off the users' content, yet that can get you into trouble too, and laws are being proposed to make some forms of moderation illegal. The current easiest path for a small platform is to reserve the right to ban anyone for any opaque reason, and to do that a lot to avoid becoming the hangout place for mischief. The big platforms must find it impossible to satisfy all the regulators with one stance, especially since they're international, so they wear multiple faces instead. You at least dodge some liability by not being on the App Store. Apple will throw you under the bus for unpredictable reasons. They insta-banned several Civil War games for containing Confederate flags in a historical context, seemingly following a trend at the time.