Advertising is in crisis. More than one third of online ad traffic is fraudulent
[https://www.wsj.com/articles/SB10001424052702304026304579453253860786362], and
the ads are so annoying that more than a quarter of users block them
[https://www.iab.com/insights/ad-blocking-blocks-ads-win-back/]. Half of ads
are
never seen [https://www.comscore.