Dark Patterns
Very good site that explains how You can trick Your's user and how to avoid it. There are also examples how good patters can help.
General rule is to be honest with Your users. Do not try to trick them to send them more emails, or to bill them without noticing them after trial period.
Probably most of it can gave You more money in short term, but after that You will end up miserable.
Dark patterns - An Overview for Brand Owners
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