but lack of innovation is not one of them.
Yes it is.
Google has bought in or copied most of its successful stuff except search. Search is getting worse.
Facebook has only innovated on privacy theft in a way Stazi and Stalin's secret police could only have dreamed of.
They are parasites.
Though Google Search was once best and was brilliant, they didn't invent Search.
Facebook was late to Social Media.
Both successful, not innovators.