I don't have any insider info here, but I've worked in companies doing a lot of marketing on Google/FB/Twitter/etc, and they have pretty robust ad marketplaces.

I don't have any insider info here, but I've worked in companies doing a lot of marketing on Google/FB/Twitter/etc, and they have pretty robust ad marketplaces. There are layers of review, ads are fairly limited in what they can do, security is high. However these are only a small slice of the market, there's then a very long tail of ad networks that have much less concern for the user, these are where most of the issues are. I once refused to integrate with one (still a major network) because it required allowing them to slurp up all text entered on your site (hell no). They thought it was strange that I pushed back on this. This is post GDPR, in the UK. These are not the companies that will be implementing WEI. They might, but it's probably beyond them technically, and even if not they'll happily just fingerprint as much as they can instead. On the flip side, if you're a content creator making money from content you publish online, it would be nice to know scraping is much harder. If you're an online banking user it would be nice to know that bots will have a much harder time automating the stealing of accounts, and so on.