Almost certainly. They banned me the instant I logged in successfully, possibly because the email contains "claude.ai@". My appeals via email were ignored. 9 months later I received this, but my account is still banned when trying to log in:

Earlier this week, your account was disabled by an automated system for being in violation of our Terms of Service or Acceptable Use Policy. Upon further investigation, we believe this was an error and your account has been reinstated. We apologize for the inconvenience and thank you for your patience.

They do. It’s how I was banned for researching barbiturates.