Pitfall of (cheap) machine learning

Have you heard a story of how to kill trending video on youtube?

1. You subscribe thousands of blog accounts to channel you want to destroy.

2. After a video is published you unsubscribe all your bot's from the channel.

3. Youtube logic will assume it's because of the video and will remove a video from top lists.

4. Next day you slowly subscribe all your bot accounts to the same channel and repeat the process.

What about the story of Facebook helping spread fake information through a network?

1. Create a channel for small cats, funny jokes

2. Collect couple hundred thousands of followers

3. Change content from cats to fake news

Understand me correctly machine learning is awesome!

However cheap models could lead to problems.