Why are there nopCommerce users on my site?

I recently installed nopCommerce and got everything running. I noticed that there are 5 nopCommerce customers ([email protected]). I don't know why these are there. I had nothing on my site to order. Can someone please explain why they are there?

Did you install the "sample data"?  (An option during the installation)

No. I installed only the app. I did not notice those customers when I installed the app (actually, my hosting provider installed it). I did notice them a few days later.

Maybe these customers were already in the files used by your hosting provider. Check if they are the same as in admin demo