Learning/practice, and any use that feeds in sensitive data you want to keep on-prem.
Unless you’re set to retire within the next 5 years, the best reason is to keep your resume up to date with some hands-on experience. With the way they’re trying to shove AI into every possible application, there will be few (if any) industries untouched. If you don’t start now, you’re going to be playing catch up in a few years.