Man, fuck this website. Opened on mobile and trying to admire the painting and I get 4 popups in a row obscuring it every few seconds. Fuck whoever designed that and doubly fuck whoever signed off on it. Absolutely abhorrent behaviour that is totally hostile and disrespectful to both the user and to the material being presented.
If you disrespected them by default-disabling js, your browsing experience would improve at the expense of their metrics.
Just FYI - Firefox mobile cuts this down to one “dismiss without supporting” coverup.
I had to go check with another browser to confirm the nasty behavior you described. Which does happen.