reCaptcha technology is now required on the Form widget and cannot be removed.
The vast majority of your visitors will only have to click the "I'm not a robot" box and nothing more. If they are suspected of being a spammer or robot they will see a picture puzzle to solve, but again, this is only served when reCaptcha suspects a SPAM bot and will not be seen by most of your website visitors.
If an optional SPAM filter is mandatory for you, we advise using an alternate form service at this time. These Google Search Results will provide you a wide selection of form services you can choose from.