Restrict User Registration on Joomla
Your website is starting to receive spam account registrations, and the number is increasing over time. You want to block them, and this plugin will help you do exactly that.

This plugin is designed to restrict user registration.:
- Allow or block account registration by country.
- Check the user's IP address and email before registration. If either is on the blacklist, the plugin will block the registration.
* This plugin is compatible with Joomla 3, 4, 5, and 6.
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After installing the plugin, go to Admin Panel > System > Plugins > JMP Restrict Registration to get started.:

Set the necessary parameters, then enable this plugin.
Note: This plugin requires cURL and allow_url_fopen is On. You can check it from Administration > System > System Information > PHP Information.
What is wrong?
That imported page keeps on saying this, but nothing further is happening...
1. The "radio buttons" extra field doesn't transfer the values in the additional field, e.g., "yes" or "no," and only enters certain values into the #__fields_values database.
2. The "textarea" extra field with the "Use editor" option checked converts to "textarea" when it should be "editor."
3. In K2, the extra field group is assigned in the category. In Joomla Articles, the category is assigned in the extra field. It would be nice if this were automatically completed. A checkbox could be added if someone doesn't want this option.