WordPress.org review is in progress. Until then, you can install CAPTCHAL.ink manually by downloading the ZIP and uploading it from your WordPress admin panel.
Use this direct file:
http://captchal.ink/captchal-ink.zip
captchal-ink.zip and click Install Now.Service base URL (usually https://captchal.ink).
The plugin injects a hidden captcha_token in form submit and verifies it server-side using:
/api/verify.php. Default free keys are prefilled in plugin settings.
Service base URL.