Some sites limit things like self defense, gambling, internet marketing, weight loss, etc...
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Since hubpages earns through Adsense, they stick mainly to Adsense policies on content.
Some examples of things you can't write about: Adult Topics, Gambling, Guns, Drugs.
Read the Adsense ToS or the hubpages help section for more information.
You can help the HubPages community highlight top quality content by ranking this answer up or down.
Whatever is against AdSense's TOS is forbidden:
Yep, a bunch: Adult content, gambling, overly promotional...
Look at the Help or FAQs.
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