My point is it's an easy problem once you decide that you don't care about false positives, ie temporarily banning "legitimate" users whose behaviour is indisti

My point is it's an easy problem once you decide that you don't care about false positives, ie temporarily banning "legitimate" users whose behaviour is indistinguishable from that of bots. Arguably, those "legitimate" users don't bring anything of value to the platform or society as a whole and should rightfully be shunned. Most online forums or chats have automated rules whereby posting too fast or too often will get you slowed down or banned. Sometimes legitimate users get caught by the filters, no big deal. Twitter could make their existing rules much more stringent.