Costs change the dynamic and allows it to be a more focused problem. For example spoofing as part of DDoS is now cost-prohibitive as you either cannot achieve

Costs change the dynamic and allows it to be a more focused problem. For example spoofing as part of DDoS is now cost-prohibitive as you either cannot achieve the scale needed or you are too slow to be effective... which makes the market for booter service less viable at their low cost. For ad-click stuff it wipes out the bottom of the market and forces the fraud on higher value adverts where it is more visible. For e-commerce bots trying to buy the latest sneakers in sneaker drops this cost is irrelevant as the benefits are huge, but... with enough of the other fraud reduced companies that provide services to protect here can focus more resources here to make it harder. Similar to how the most effective spam I now see on sites I operate is actually now human generated by cheap human labour (effective meaning "gets past layers of detection that stops it early")... the spam problem for me is effectively solved as it's been reduced so much and humans are slow and inefficient.