Finally found a comment that makes sense actually [0]:
"Powered by X" is on millions of web pages because it gets autogen'd by popular web-facing CMS (Joomla, Wordpress etc). So when a search query includes "Powered by" google must determine which among the billion pages with this
phrase is most relevant"
"Powered by X" is on millions of web pages because it gets autogen'd by popular web-facing CMS (Joomla, Wordpress etc). So when a search query includes "Powered by" google must determine which among the billion pages with this phrase is most relevant"
[0] https://twitter.com/bradcog/status/1158008651619004417