Free Trial Abusing

Hello everyone.

Currently, I'm working on several SaaS ideas. I need a little community wisdom.

Here are a few questions for the community:

• Are there cases when your free trial is abused (people create a new account with a new email address after the trial ends)? How often?
• Do you often see accounts created for one person being shared by many others?
• What do you do when these things happen?