The Coudlfare Turnstile field is available in every version of Profile Builder, and it can be used to protect your forms against spam user registrations.
In order for this field to work, you will need to generate the keys for it on the Cloudflare website. The steps required to generate the keys can be seen here.

This field can be added to the login, register, and recover password forms created with our plugin, and also to the default WordPress forms. You also have the option to choose the theme for the Turnstile widget.
This is how it looks in the front-end.

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