These are, as it is easy to guess, the list of sites that have gained or lost Zoom Authority points since the previous survey (updates are performed approximately once a month), which can then serve to analyze the ongoing changes on SERPs, for example after Google updates.
ZA Observatory
Interesting news for the Zoom Authority Observatory feature: in addition to showing the graphical distribution of all domains grouped by Zoom Authority level, in fact, it now presents two very useful tables, Winner Domains and Loser Domains.