How damaging is Max Verstappen's criticism to F1?

To answer the question posed really depends on the perspective from which it is viewed.

For Liberty Media, the owners of F1, Verstappen is a difficult ambassador. 

Whilst they have invested hundreds of millions transforming the sport into an entertainment spectacle, the four-time champion has this season called the sport artificial, reinforcing his words by comparing it to Formula E and Mario Kart.

With remarks like that, Verstappen is appealing to the purist; in contrast, Liberty Media is targeting the new, younger fan, raised on Drive to Survive. If the best driver in the world says the sport is complete rubbish, it undermines the marketing strategy. 

Partly due to the Americanisation of the sport, F1 wants to be increasingly associated with glamour. Verstappen’s down-to-earth criticism sometimes takes the shine off that a little. Is that a problem? Only for those who concern themselves exclusively with the business side.

On the other hand, Verstappen acts as the moral compass of the sport. Because he is the best, he can say things that a newcomer cannot afford to. In a world of rehearsed PR, his honesty is appreciated by many fans. 

It prevents F1 from completely degenerating into a choreographed show. With his honesty, candour, and uncompromising dedication to improvement, he single-handedly embodies an attitude that, amidst the powerful current of show business, steadfastly upholds the values of motorsport.

What about Verstappen's personal image?

The 'damage' to his own image is likely to be only superficial. As a four-time champion, he can say what he wants off the track. His criticism is seen more as a sign of authenticity than pure negativity.

The criticism is, therefore, not necessarily harmful to the sport itself, but rather to the business model Liberty Media has in mind. It creates a healthy tension: Liberty Media provides the money and the growth, Verstappen guards the soul of racing. 

Ultimately, both parties need each other: F1 needs a strong champion, and Max needs a podium to showcase his talent.

If he no longer finds that in F1, there are other podiums where he would be only too happy to shine.

That, perhaps, would harm F1 more than any spoken word.