Magento 2 Spam and Bot Blocker extension can help a store owner or admin to block some certain customer or group of people to the specific user string, unique IP address, and or IP address range all from within the user-friendly admin panel.
1. Admin can set some restriction on customers email id, set the character for name, etc using Magento 2 bot blocker tool.
2. Easily block a user using their IP address.
3. Help to identify spam accounts.
4. Restrict some customer of a group account to set some account limitation.
5. Configure email domains to restrict fake registration spam.