Can the system tell if a post or comment (not sure about memos) was created by manual input or not, simply by noting the time it was started, and then posted?
Once I start a post, I can come back to it later even if I close the window, so somehow a draft is saved somewhere. Maybe a time stamp too? Some people are really slow typists, and even the fastest can't hope to match a bot. And the faster you type, the more errors, which means back-spacing and re-typing. Maybe the back-space keystroke could be another indicator, if keystrokes are noted. (And if someone's copy/pasting from another document, it still takes time, and all the fields aren't filled in almost instantly.)
Anyway, bots input much faster, that's the point of a bot, to multiply the effort of a single human. Maybe if we could detect and block them by their reason to exist, people wouldn't bother with them anymore. We'd still have manual spam of course, but I guess that would be less of a problem?
No, the system can't tell if it's a manual or automated submission. The draft is saved in your browser's cookies. Bots don't use browsers, they send programmed transactions directly to the blockchain via python or javascript.