Sites sharing traffic trend for YEARS

All three of these sites share the same subject matter & are the same type of website for the most part.

Look how close the top two are over multiple years, except for slight variations they seem like the same site but one's wearing stilts to look taller.

Surely such a coincidence couldn't happen for that many years.

Out of curiosity, what was the subject matter of those sites? That might give us a clue as to why the patterns match.

I'm quite confused, what's your point joebert??? the graph shows the two site traffic is near to each other and the other one was left down...

Don, the subject matter is similar to that found at Ozzu.

psyche, the third, blue line site is mostly irrelevant. I left it there because I just happened to be looking at three sites.
Look at the other two though, they're not just similar, they almost look like twins. From just before the 2006 mark untill today, each rise and dip matches with only a small variation between the two.

Would thoses sites be that of

ozzu.com and bigwebmaster.com ?

I'm not going to divulge the names.

As far as I know, the two sites in question are owned by different entities.
They're actually registered to companies in different countries.

Well I know what the blue line is and if you look at ozzu.com and bigwebmaster.com you will find the same trend. Both are almost the same execpt for a small section.

However, they are also related, as in the same company. For a webpages to not be owned my the same company to relate like that is rather strange. Do they affilate with each other?

There's no obvious affiliation between the sites.