Perhaps you are not aware of the effect illegal rentals are having Astaroth. Read here for an example:
https://qz.com/1153390/paris-threate...tment-rentals/
Googling 'illegal airbnb rentals' will find you plenty of other examples.
But the issue is not one of just 'pushing the boundaries' as you put it. It is also an issue of 'unintended consequences'. When your renting a Paris apartment impacts those who work and live in Paris and cannot find a place to rent long term, you are personally affecting those people in a negative way. Is your short term wish to rent an apartment for a few nights, more important than their need to rent long term? That is one unintended consequence of Airbnb. Look at the number of listings in Paris, 65,000! When someone rents a room in their home as a normal B&B does, that has no real impact on the local long term rental market. But when they rent out the entire house or apartment, that does impact the long term rental market obviously.
When someone has lived in a Paris(or anywhere else) apartment building for 30 years and suddenly find themselves living next door to what has become in reality a 'hotel apartment', with constant comings and goings of strangers at all times of day and night, strangers who have a key or access number to enter the building which is someone's home, it is not hard to understand how those who are resident can be unhappy with such a situation. When you use Airbnb Astaroth, you may be happy with the experience but those living in the apartments next to the one you rented may not. What consideration is given to them?
https://www.google.ca/search?q=all+m...hrome&ie=UTF-8
When rather than someone renting a room in their home or even their entire home when they are themselves away for a short time (the original concept of Airbnb), it is exploited by people who buy or rent homes with the sole intent of turning them into short term rentals on Airbnb et al, what then?
https://www.engadget.com/2016/10/19/...san-francisco/
What about people who are evicted from their home so it can be turned into a Airbnb rental?
Evictions and Conversions: The Dark Side of Airbnb
I could go on Astaroth but anyone can find out more for themselves simply by taking the time to Google on the subject.
Airbnb has fought any attempts to have them restrict listings, tooth and nail. Where they have agree to changes it is only after they have seen they are going to lose the battle. Listings mean bookings and bookings mean profit. Airbnb are now a big corporate business with only one goal, profits. The unintended consequences of their business and the morality of it are not of interest to them. They knowingly allow illegal listings in places like Paris, because it makes them more money. It's as simple as that. They don't care if it drives long term rental prices up; has people evicted from their homes; has people find their apartment building has been turned into a de facto hotel, etc.
So when you write that you are not too personally concerned if an owner is renting illegally, I can understand what you are saying, but do you understand what you are contributing to? Are those unintended consequences not of concern to you?