Because no one wants to be the reason a local market turns into a souvenir stand.
This NYT article reminded me of your post! https://www.nytimes.com/2025/06/26/world/europe/uffizi-selfies-tourists-museums.html
This NYT article reminded me of your post! https://www.nytimes.com/2025/06/26/world/europe/uffizi-selfies-tourists-museums.html