Google May Update

[krishru]

As per google the May update takes care of all content scrapping sites

Then why is this site - http://www.viduba.com is still having good ranking ?

All of its videos are hotlinkled from youtube

[krishru]

Yes the other sites in SERP are not very competitive , do not have access to semrush logs any more

[RyanKent]

Again, the term "well" is very relative. You can be a relatively bad site, but if the other sites using that term are worse, then you can rank well.

Can you offer some examples for key words that this site ranks in the top 3 for? If not, then choose their best ranking key word from the first page of SERP.

[krishru]

I have even checked the site with semrush.com , it does rank well for many kewords

[RyanKent]

Alexa is ranking the site's TRAFFIC. That is an important thing to understand.

I can create a bad, one-page site, advertise it, promote it, and Alexa will still show the site's traffic.

That is much different the organic page ranking. The Google Panda update has to do with how sites appear in SERP. The correlation is, that sites which do better in SERP will do better in Alexa. It is possible for a site to do well in Alexa even if they don't do well in Google.

[krishru]

Becasue they have good alexa rank , which is not manipulaed and something I have been monitoring for past 6 months and it has gradually increased

I got interested in the site siince their sister site  - http://vidoevo.com/ was autctioned on flippa.com some time back... Even this site has good rankings ...I have been tracking them ever since

[RyanKent]

How did you determine they have "good" ranking?

They have a domain authority of 15, which I wouldn't refer to as good ranking.

[Theo-NL]

These updates by Google are applied algorithmically. This means that they are applied based on a set of standards, which should affect as many 'bad' sites as possible, while at the same moment affect as few 'good' sites as possible.

For some reason the website you're mentioning apparently didn't match the algorithmic criteria to get hit by lower rankings (on this series of updates).