This was a request many months back but seemed to be ignored.
It's nice having a form builder but without having a spam tool that works along side it, it becomes a problem long term.
I did suggest Akismet - even down to getting their own developers to contact you to work with you to integrate their API system.
I get we need tools and improvements but surely we are missing one vital issue? Spam protection. No Honeypot or Google ReCaptcha works as good as it should these days.
I have seen one 3rd party developer that seems to have a solution in place - https://en-gb.wordpress.org/plugins/contact-forms-anti-spam/. Brilliant plugin and highly recommend. Unfortunately the developer wont support forms that are not well established. Surely digging into his code will give you an idea of how it works and add it as an option to the roadmap.
PLEASE take this seriously. You could have all the tools in the world to making your form builder the best on the market but if you don't have the most important part to any form in place - SPAM PROTECTON then you will loose your place to your competitors.