How to disallow registration bypassing the EasySocial

Hello. During 2 days I can see how there is new accounts (spam users) creating without EasySocial registration. All account has word “Sort” in realnames (example at the screenshot). https://crimson-land.ru/members

I don’t know for sure how they are registering. May be by using standard Joomla form. But I don’t know Link at the moment (and have not idea how to disable).

May be EasySocial has some option I missed?
To redirect from standard Joomla registration to EasySocial registration form?

Can you give me a hint?

P.S: I have to use auto activation user instantly after regustration.

Thanks.