Fact check?
I may be missing something here, but if you visit the link to AppCheck, doesn't the graph suggest that Daily Active Users has actually gone from a peak of around 16 million users to around 9 million? (The 3rd graph down, with the red line.)
The graph in the article is daily users as a percent of monthly users - 40% down to about 20%.
Okay, so the main thrust of the argument is still the same, but y'know, pendants abound.