The reason for early admission is to be done with the college application process. If for some reason, you decide not to go the school that admitted you, you will need to do a little research.
Every school is different and you should be aware of the consequences if you don’t attend that school.
Some reasons are acceptable, mainly if you don’t get the Financial Aid package you expected. But there may be penalties if you don’t attend. Make sure to be familiar with all the rules for early admission to your school of choice.