So I found an easy to rank keyword. It's a keyword for blackhat CPA, first page it's full of forums thread and youtube videos with no links at all. I built a website for this keyword. After a week, with no backlinks, my website popped up on position 12 (page 2). After 24 hours disappeared from serp. After another week my website popped up on position 13 (page 2). After 24 hours disappeared from serp again. After the third week, now my website popped up on page 6, and it's stable for 3 days now. All of this with 0 backlinks built. What's the meaning of this serps' behavior? Why popped up on second page? It's something like sandbox? Should I consider myself on position 12-13?