how would DUers go about stopping this site from allowing ULTRA-intrusive ads

If DU needs money and runs some ads, OK. But lately, both on DU and generally, I have seen an exponentially rising number and intrusiveness of ads -- eg "you have been selected for a free gift" with ONLY an accept button and impossible to turn off without disconnecting DU altogether and signing back in. This kind of ad that can't and won't be readily erased is becoming increasingly common. Both DU as a site should ban them and they should be banned in law, and if there is some protestation about free speech (somehow with all the crap that's tolerated, my own speech never seems to be protected) then it should at least be heavily taxed.
Indeed any ad that delays or blocks even part of your view, requiring an extra click to get rid of it, should be heavily taxed -- a good way to both raise revenue and to reduce crap on the internet

I AM FED UP WITH THIS