By default, Shopify has two forms of captcha enabled to help prevent spam through customer, contact, and blog comment forms:
Google's reCAPTCHA v3 analyzes website visitor behavior to provide a score to indicate the likelihood of the visitor being a bot. Shopify uses this functionality to help block spam from bots, and reduce friction for real customers by eliminating captcha challenges if the score is high enough.
The reCAPTCHA logo is visible in the bottom-right corner of all associated pages to notify visitors of the behaviour analysis, however you can opt to show a text disclaimer with the form instead.
If merchants choose to disable reCAPTCHA v3, or the reCAPTCHA v3 score is low enough, then Shopify will fall back to a regular captcha. This captcha will trigger a challenge if customer, contact, or blog comment forms are submitted more than once, in any combination, from the same IP address within a 24 hour period.
Show a text disclaimer
As is noted above, if reCAPTCHA v3 is enabled, then the reCAPTCHA logo will show in the bottom right corner of any associated pages. However, you can choose to show a text disclaimer with the form, rather than show this logo.
In order to do this, you need to include the following code within any forms you wish to change this for: