And for "Facebook", Google Trends shows a 71% drop worldwide over the last 5 years. Their Q2 2019 earnings showed a 20% worldwide growth in monthly users over the last two years alone. "YouTube" shows a 45% drop over 5 years. "Google" itself shows a 60% drop over 5 years.
Google Trends can't reliably tell you anything useful about a site's growth or activity. I'm not denying it correlates with your specific app, but that doesn't mean it will work for everything, and it clearly works very poorly for popular services.
Google Trends can't reliably tell you anything useful about a site's growth or activity. I'm not denying it correlates with your specific app, but that doesn't mean it will work for everything, and it clearly works very poorly for popular services.