I believe that the key of the message was that the advertisement companies gather a plenty of personal data and vulnerable groups are very easy to find and target. The same private data is also useful for "all the people who host scam sites on the cloud".
This. The more ad platform becomes accurate, the more ads will exploit vulnerabilities in human mind. Some might believe they don't have such vulnerabilities, but there can be some in subconscious level. Ad tech is basically PSYOP and people really should be on guard.
