I use both the hidden honeypot and a random javascript injection that has to be matched server-side. Both have to pass. The "problem" with this kind of tricks

I use both the hidden honeypot and a random javascript injection that has to be matched server-side. Both have to pass. The "problem" with this kind of tricks is that they works for small/medium website and only if they are not adopted as part as a big library that everyone uses. They are not that hard to beat if you want to spam someone intentionally or if they are implemented by a well known plugin for (wordpress/joomla/etc..)