News about factors influencing Android Apps :
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The only change I know is the June 29th information in the linked blog.
'Over the last year, we've been enhancing our search and discovery algorithms' consideration of app quality and user engagement. This means that apps and games that have high retention rates, low crash rates, low uninstalls, and many other factors, are recommended more often.'
Some individual developers in Korea are talking this change seriously.
Some types of games are said to be seriously impacted by player accessibility after this change.