Also, I fail to see wha's so terrifying about that.
In 2015 it looks like 10-15 rentals a day.
There is an obvious lack of data cleaning here. You can see from the first places drawn on the map that a lot of them are duplicated. I don't think that many people have multiple dwellings in the same area.
"Of all London's Airbnb listings, 41% belong to hosts who are listing more than one rental, according to Inside Airbnb."
I guess most major cities around the world face this problem but this is a nice visualization.
The mega-trends happen whether you like them or not. Adapt or die.
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 (with exceptions).
If the situation in Amsterdam is similar to Berlin, this means that every one of those dots is an apartment that locals cannot use. Tourists are, on a way, taking over their city, and those that live there have to reshape their lives to accommodate them. The citizens of Amsterdam, the ones that make it a nice place to visit in the first place, are losing access to their own city.
 Minus the data cleaning issues mentioned somewhere else
Or - maybe - subtracted from the potential wealth of hotels and similar.
I'm not sure what the overall impact of Airbnb will be on the more low-end jobs. Sure you won't need bellboys etc, but cleaners will still be handy. I remember reading about a guy who had a very smooth Airbnb operation. He had dedicated fixers (electricians, furniture restorers, etc), and cleaners. So all he really had to do was approve random people who wanted this house for a while, and he was effectively making 2x what he would from rent, though this might have been riskier than just renting it out.
EDIT: Here it is:
The rules for max 60 days in Amsterdam (pre-existing but that seemingly noone respected) are now seemingly effective at AirBnB level, at least in theory:
and that may contribute to change (either increase or decrease) the numbers of "dots" (or maybe not).
The need for cleaning and maintenance is more or less directly connected to number of guests/nights rented, if guests go to AirBnB's they don't go to the hotels, and the SAME cleaners and maintenance people that used to work fulltime for the hotel will start working part time with the hotels and part time with airBnB's.
As long as the availability of AirBnB's actually increases the number of tourists/guests in a given area/city, that is "added wealth" otherwise it is "shifted wealth".
Conversely - since usually AirBnB's tend to be cheaper than hotels and other similar forms of accomodation, it is "shifted wealth with a reduced amount" (the lower price which is "lost" in favour of the customer + the AirBnB commissions that go somewhere else).
As a side effect the same apartment that was rented for a "decent" price to a local is now used in AirBnB, so the locals must pay much higher prices for long term length.