Integrate new spam detection method

[Zodiac1978]

We could integrate https://wordpress.org/plugins/js-antispam/ for example as a new optional feature.

What do you think @bueltge @websupporter @schlessera ?

[bueltge]

This is my spam shield since I release this plugin. So yes, I like this method, simple, no additional data, no request, it works.

[websupporter]

This seems interesting. I would like to talk about this during our Meetup after Wordcamp Stuttgart.

[Zodiac1978]

And another interesting plugin to look at: https://github.com/BinaryMoon/wp-toolbelt/tree/master/modules/spam-blocker

[Zodiac1978]

And another one which is usable without third-party services: https://geek.hellyer.kiwi/plugins/spam-destroyer/

[Zodiac1978]

This is a great resource for new patterns too: https://perishablepress.com/7g-firewall/

[PopVeKind]

Edit by @krafit: To keep this issue tidy, I moved this comment into its own issue #339