If your site allows users to create new accounts in My account page as shown below, then you may experience SPAM registrations by bots controlled by hackers:

If your site is suffering from SPAM registrations, there are 3 main actions you can take:
If your site is suffering from SPAM registrations, then you can consider preventing new account registrations in the My account page. Your real customers will still be able to create new accounts during the checkout process.
To prevent new account registrations in the My account page, navigate to the Accounts and Privacy tab in the WooCommerce settings then uncheck the checkbox as shown below:

Switching to a double opt-in registration process should prevent almost all SPAM registrations. The flow for the the double opt-in registration process is as follows:
Spammers and hackers typically use fake email addresses when they attempt SPAM registrations. With fake email addresses, steps 3 and 4 of the flow above are never completed so no new accounts are created.
To implement double opt-in registration process, visit the Account Registration tab in the wp2print settings. Enable the checkbox Validate email for new registrations then complete the subject and body content of the email the customer will receive as shown below:

Below is an exampe of the email a user will receive after they register for a new account in the My account page:
