I understand what you're saying and from what I've personally seen, Microsoft's pages receive less of these than most others. However, the design of the advertising structure itself is the real problem here and always has been.
As I understand it, the ad networks contract to provide advertising to the page owners like Microsoft, which they then use to supply access to particular demographic groups to the advertisers, who buy these by blocks of ads. With this isolation between
advertiser and page owner, it's the ad networks that are responsible for vetting and with the margins they make, there's little interest by them in performing this action.
I believe I've seen mention of yet another layer in these transactions, but even without this it's easy to see why the problem exists. The page owner simply wants revenue, as does the ad network and the advertiser just wants their ad to reach lots of potentially
valuable eyes. In the case of popup purveyors, the demographics are only partially important, since what they're truly after is simply potential targets who might be prone to responding to their scams, which could be anyone.
With the trends towards more targeted systems and apps, the interest in general web pages is declining, so this makes any additional effort to protect and maintain this avenue of less concern at all levels as well. I think we're simply seeing a symptom
of this decline as the more knowledgeable user moves away from the browser to devices with apps, which by their nature are less susceptible to such simplistic forms of attack.
Just think back about the typical type of user we've seen here over time, with the more knowledgeable mostly disappearing as those still holding onto the older technology appear to be most common now. It might seem that this is due to the better protection
provided by Windows 10 and current security it includes, which to an extent may be true, but I feel it's more a reflection of this migration to modern devices and apps within the consumer market.
Rob