Not a fan of advertising (online or otherwise, wish online wasn't exclusively...targeted) (tax it!) but bubble accusations seem unfounded. It's possible to find

Not a fan of advertising (online or otherwise, wish online wasn't exclusively...targeted) (tax it!) but bubble accusations seem unfounded. It's possible to find negative or uncertain returns to spend but that doesn't make a bubble. Relatedly the first and third results for https://hn.algolia.com/?q=bubble https://hn.algolia.com/?q=bubble are https://news.ycombinator.com/item?id=17060085 https://news.ycombinator.com/item?id=17060085 (2018 GDPR Will Pop the Adtech Bubble; didn't happen) and https://news.ycombinator.com/item?id=10572863 https://news.ycombinator.com/item?id=10572863 (2015 The Adtech Bubble; the end was not nigh).