It seems odd to cherry pick 2019 as a start point, it lacks context whether this is part of a longer and bigger decline which blipped back up in 2020 due to cov

It seems odd to cherry pick 2019 as a start point, it lacks context whether this is part of a longer and bigger decline which blipped back up in 2020 due to covid or whether this is a newer problem after a long period of growth. The more simplistic answer is: ChatGPT.