[NSFW] Dealing with SPAM.

recaptcha you seem to have integrated via Contact Form 7. You can find it in the backend under Forms > Integration.

This recaptcha does not protect the registration form, which the WooCommerce plugin provides. There are a lot of plugins that can help you with this. Here is a selection: https://patrickposner.dev/tutorials/complete-guide-to-woocommerce-anti-spam/#10-best-WooCommerce-anti-spam-plugins

If you have more questions about WooCommerce, you can find their support forum here: https://www.ads-software.com/support/plugin/woocommerce/

Apart from that, you can also install a security plugin like iThemeSecurity or Wordfence. They can also help against spam registrations – and secure your installation in even more places.