To me this project doesn’t make much sense:
It’s based on the download number which is quite useless as others pointed out here already – and which is known for years, due to the fact how wordpress-dot-org repo statistics are.

And the overall principle is wrong, so wrong, that it will lead to this, that a small number of the same plugins will always stay in this Top 50 or “rotate” (appear very often).

A plugin with millions of installs also has a high number of daily downloads – because such plugins are ranking better in search results etc. and appear more often to users.

And when those plugins get updated they can generate incredible amounts of downloads during a day.

So what is the thought behind such a list?
Always the same bunch of already known and popular plugins featured everywhere? Who needs this? No one.