User blog:2x EW/People getting memberships all the sudden

Alright so lately I've been seeing non members becoming members. I thought some friends were referring them or something. But today when I login to my spare account I got a free membership and I was shocked since I don't think any friends would refer that account so I logined to my other spares and it turns out 7 out of 13 spars became members? And the other 6 didnt become members even though they were attach to the same email

And it's happening to random nms can someone explain this?