Joy!

Going to the Dark Side* = As in the example below of taking away a free tool, Mandrill plugin, and require a membership (with high fees) to continue using it.

Reference:

Important Changes to Mandrill
http://blog.mandrill.com/important-changes-to-mandrill.html
“…Going forward, all Mandrill users will be required to have a paid monthly MailChimp account and verify ownership of all sending domains… “

Mandrill to Discontinue Free Tier for Transactional Emails, Developers Seek Alternatives
https://wptavern.com/mandrill-to-discontinue-free-tier-for-transactional-emails-developers-seek-alternatives
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*The Dark Side is when a person/company goes big/corporate onto a directive path without a moral compass and screws over those that assisted that person/company to attain their success.