I’m sure they can. But they can also choose not to distinguish a high quality user from a low quality one when promoting their site.

For example, this post - http://blog.kaggle.com/2017/06/06/weve-passed-1-million-memb... - talks about a million users. But does not say how many are low quality, inactive ones. Or even describe how they filtered out low quality users from their analysis.

> As a company that deals with data analysis, Kaggle can surely tell between different levels of user participation.

Kaggle outsources data analysis to bright students willing to work for a tiny fraction of their actual worth. Their business model has nothing to do with their own analytics talent.