A reddit user by the name of oops777 made a subreddit aimed at crowdsourcing the identification of bombers that entered the Boston Marathon. This was a crowdsourced effort that had good intentions to find potential culprits to be reported to the FBI. However, this went out of control, as there were some users who posted incorrect and wrong information, which then caused a 22 year old student from Brown University to be wrongly considered a suspect. It shows how even with good intentions, crowdsourcing efforts can unintentionally bring harm.

While not necessarily a platform, Google's reCAPTCHA is an example of crowdsourcing. It asks users to determine if they are actually human and not bots by performing tasks such as typing in distorted text or identifying patterns among images. While this may seem simple, it is actually to gather data that is then used in AI and other ML systems. Google intentionally created this task and gave it to their users to gather data to create proficient AIs, which matches the crowdsourcing criteria.