How is this terrifying? Each one of those dots represents actual wealth being created.
Here's an aspect. In Berlin, landlords realized they could get three times as much from an apartment by putting it on AirBnB rather than actually renting it to someone. The situation got so bad that it is now illegal to rent an apartment where you don't actually live[1] (with exceptions[2]). If the situation in Amsterdam is similar to Berlin, this means that every one of those dots[3] is an apartment that locals cann…
In my experience hotels in Amsterdam are expensive and low quality. Perhaps if this weren't the case, there wouldn't be such a market for AirBnB. Moreover, tourists bring huge amounts of money to Amsterdam. Without this the city and its citizens would be considerably poorer.