New WordPress Users registered while site is still under development

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Recently I started a new WordPress blog and didn’t add any forms for user registrations. But I got a email from my site saying that new users was registered. Still I haven’t written any post or didn’t advertise anything. still Im building it. When I check the site users it was as below.

Now my questions are,

1) What kind of attack is this. How did a attacker find my site while im just building it?

2)They are registered as subscribers, am I safe to just delete them?

any guideline from an expert will be highly appreciated. please advice me what should I do? Thanks.

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