Or you use confirmation bias to tell yourself it's an innocuous use case that won't hurt anyone.

Or you use a bandwagon argument like "everybody else is doing it, so why can't we" or "everybody else is doing it so it doesn't make much difference if we do too"

Or you use a library for ads such as the google-ads-api npm package, without checking it, so you don't realise how much data it's collecting on your users...