There is a lot of bikes in Amsterdam in general. Van Moof just stands out because of their 1 marketing, 2 annoying signature noise whenever people bump into them, 3 loud owners that general use it as a status symbol and 4 joke status due to national Dutch publications writing about all the shortcomings of owning this bike.

I live in Groningen, a Dutch city that is even more suited for bikes, and I rarely spot any Van Moof here. There is a big amount of Swapfiets though, because there is a bigger demographic for a sturdy bike that costs 20 euro as month. You can have that bike in theory for 8 years and it still will not have the same cost as a Van Moof.