Related Clues:

• Self-serving opportunist, perhaps
• Exploitative sort
• Utility customer
• One who has logged in
• Manipulative one
• Target of certain fees
• String puller
• One logged in
• Computer owner
• Friendly opening?
• Internet patron
• One who isn't 'clean'
• Abstainer's opposite
• Not an abstainer
• One to whom a warranty applies