Unknown user tries to register! Does anyone have this experience?

Hi Guys,

I have created two apps with Strapi (Frontends Browser / Android / iOS), and I have published one of them but have not yet announced it.

In my strapi I see that an unknown user is trying to register with the data such as:

Username: Johnelgo
Email: elgoogclass6@gmail.com

Username: joe_doe
Email: elgoogwave10@gmail.com

However, neither of the two registrations is confirmed. - very strange! :thinking:

Here someone has the same experience:
https://forum.pcsoft.fr/fr-FR/pcsoft.fr.windevmobile/42827-etes-vous-deja-tombe-sur-adresse-email-style/read.awp

Who has experience of app publishing? Is he an app reviewer from Google or Apple?

Thanks in advance!