pixel_player531320204 There are ways -- they may or may not pass muster on "general". Generally there's a "report" button in one of the corners... but the corner varies from ad-provider to ad-provider! And some of them may lack it entirely, I dunno. But if you can, use the provider's blocking/reporting facility if you can. For example on my last ad, the initial widget in the TR corner looked like:
Which pops up as a small menus offering these options:
Ideally, use those first, but if they don't work, or aren't available, then use a support ticket to Pixel, with a screenshot of the ad or an identification of that and preferably the provider, too. If particular providers are themselves bad actors, it's up to the Pixies to drop them.
I do agree on the auto-opening ones -- very sneaky. On taste grounds I sympathise. I hesitate to start blocking on those grounds, though, as a I recall the dark days of "no ad available" for attempt after attempt after attempt...