Using a CAPTCHA such as ReCAPTCHA is very strongly recommended for public forms which allow unauthenticated users (guests) to submit them. Otherwise submitting spam is trivial.
Moreover, please contact the developer of your forms component and ask them if they are using Joomla's anti-CSRF form token. If not, they should be. That was all the CSRFShield was doing behind the scenes. The problem is that it was trying to do it in places where it shouldn't and there was no reasonable way to implement a configuration to tell it when and when not to do it, therefore I had to remove it.
Thanks for the heads up about the product pages. I know, I just didn't have the time to update them yet :)
Nicholas K. Dionysopoulos
Lead Developer and Director
🇬🇷Greek: native 🇬🇧English: excellent 🇫🇷French: basic • 🕐 My time zone is Europe / Athens
Please keep in mind my timezone and cultural differences when reading my replies. Thank you!