Earlier quoted context omitted.
Both. It can be both. Compare to food: it's like demanding that Walmart screen all the food itself to protect you and then you'd screech at Walmart and only Walmart for not making sure Keloggs cereal is healthy while letting the manufacturer off the hook with zero (I repeat, zero, none, null, NADA) consequences for fraud and damage they caused. The way media, HNers and other people behave is creating a situation that…
Except Walmart has to follow certain standards to ensure the products it sells are legitimate. If they'd literally just accept products from random unmarked vans and put them up for sale, they'd be very much on the line if those products end up being unsafe. Likewise you can't just sell stolen goods even if you don't know they're stolen. They'll be confiscated at best and you'll be charged for fencing stolen goods at…
Remember that we punish the companies that build products against standards first, not just Walmart for stocking them. We also don't trust exclusively just Walmart to set and enforce food safety standards (because that would be problematic for competition wouldn't it)? We have independent standard bodies.
And right know we have NOTHING to beat Google (or Apple or anyone) on the head with because there's no standard or rule they've ignored when they allowed this ad to be published.