Our statistics show that the campaigns that fail are those that start to progress slowly. On the contrary, campaigns that get off to a good start are less likely to fail, because Internet users then make purchases to complete them.
To reduce the risk of failure, we allocate clicks by default to the campaigns with the slowest progress, which significantly reduces the number of failed campaigns.
However, if you wish to attribute your click to a particular campaign, or change your default settings related to clicks allocation, this is entirely possible. To do so, we invite you to follow the detailed instructions provided in this article: How do I choose which campaign my click will be allocated to?